Remove tabs after spaces in C comments

This was not changed in HEAD, but will be done later as part of a
pgindent run.  Future pgindent runs will also do this.

Report by Tom Lane

Backpatch through all supported branches, but not HEAD

contrib/pg_upgrade/controldata.c

@@ -25,7 +25,7 @@
  * pg_control data.  pg_resetxlog cannot be run while the server is running
  * so we use pg_controldata;  pg_controldata doesn't provide all the fields
  * we need to actually perform the upgrade, but it provides enough for
- * check mode.	We do not implement pg_resetxlog -n because it is hard to
+ * check mode.  We do not implement pg_resetxlog -n because it is hard to
  * return valid xid data for a running server.
  */
 void

contrib/pg_upgrade/dump.c

@@ -33,7 +33,7 @@ generate_old_dump(void)
  *	split_old_dump
  *
  *	This function splits pg_dumpall output into global values and
- *	database creation, and per-db schemas.	This allows us to create
+ *	database creation, and per-db schemas.  This allows us to create
  *	the support functions between restoring these two parts of the
  *	dump.  We split on the first "\connect " after a CREATE ROLE
  *	username match;  this is where the per-db restore starts.

contrib/pg_upgrade/exec.c

@@ -147,7 +147,7 @@ win32_check_directory_write_permissions(void)
  *
  *	This function validates the given cluster directory - we search for a
  *	small set of subdirectories that we expect to find in a valid $PGDATA
- *	directory.	If any of the subdirectories are missing (or secured against
+ *	directory.  If any of the subdirectories are missing (or secured against
  *	us) we display an error message and exit()
  *
  */
@@ -187,7 +187,7 @@ check_data_dir(const char *pg_data)
  * check_bin_dir()
  *
  *	This function searches for the executables that we expect to find
- *	in the binaries directory.	If we find that a required executable
+ *	in the binaries directory.  If we find that a required executable
  *	is missing (or secured against us), we display an error message and
  *	exit().
  */

contrib/pg_upgrade/page.c

@@ -28,11 +28,11 @@ static pageCnvCtx *loadConverterPlugin(
  *	the PageLayoutVersion of the new cluster.  If the versions differ, this
  *	function loads a converter plugin and returns a pointer to a pageCnvCtx
  *	object (in *result) that knows how to convert pages from the old format
- *	to the new format.	If the versions are identical, this function just
+ *	to the new format.  If the versions are identical, this function just
  *	returns a NULL pageCnvCtx pointer to indicate that page-by-page conversion
  *	is not required.
  *
- *	If successful this function sets *result and returns NULL.	If an error
+ *	If successful this function sets *result and returns NULL.  If an error
  *	occurs, this function returns an error message in the form of an null-terminated
  *	string.
  */
@@ -122,7 +122,7 @@ getPageVersion(uint16 *version, const char *pathName)
  *	This function loads a page-converter plugin library and grabs a
  *	pointer to each of the (interesting) functions provided by that
  *	plugin.  The name of the plugin library is derived from the given
- *	newPageVersion and oldPageVersion.	If a plugin is found, this
+ *	newPageVersion and oldPageVersion.  If a plugin is found, this
  *	function returns a pointer to a pageCnvCtx object (which will contain
  *	a collection of plugin function pointers). If the required plugin
  *	is not found, this function returns NULL.

contrib/pg_upgrade/pg_upgrade.c

@@ -18,7 +18,7 @@
  *	FYI, while pg_class.oid and pg_class.relfilenode are intially the same
  *	in a cluster, but they can diverge due to CLUSTER, REINDEX, or VACUUM
  *	FULL.  The new cluster will have matching pg_class.oid and
- *	pg_class.relfilenode values and be based on the old oid value.	This can
+ *	pg_class.relfilenode values and be based on the old oid value.  This can
  *	cause the old and new pg_class.relfilenode values to differ.  In summary,
  *	old and new pg_class.oid and new pg_class.relfilenode will have the
  *	same value, and old pg_class.relfilenode might differ.

contrib/pg_upgrade/relfilenode.c

@@ -79,7 +79,7 @@ transfer_all_new_dbs(DbInfoArr *old_db_arr,
 /*
  * get_pg_database_relfilenode()
  *
- *	Retrieves the relfilenode for a few system-catalog tables.	We need these
+ *	Retrieves the relfilenode for a few system-catalog tables.  We need these
  *	relfilenodes later in the upgrade process.
  */
 void

contrib/pg_upgrade/util.c

@@ -266,7 +266,7 @@ pg_putenv(const char *var, const char *val)
 
 		/*
 		 * Do not free envstr because it becomes part of the environment on
-		 * some operating systems.	See port/unsetenv.c::unsetenv.
+		 * some operating systems.  See port/unsetenv.c::unsetenv.
 		 */
 #else
 		SetEnvironmentVariableA(var, val);