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/hstore/hstore.h

@@ -12,7 +12,7 @@
  * HEntry: there is one of these for each key _and_ value in an hstore
  *
  * the position offset points to the _end_ so that we can get the length
- * by subtraction from the previous entry.	the ISFIRST flag lets us tell
+ * by subtraction from the previous entry.  the ISFIRST flag lets us tell
  * whether there is a previous entry.
  */
 typedef struct

contrib/hstore/hstore_gin.c

@@ -13,7 +13,7 @@
 /*
  * When using a GIN index for hstore, we choose to index both keys and values.
  * The storage format is "text" values, with K, V, or N prepended to the string
- * to indicate key, value, or null values.	(As of 9.1 it might be better to
+ * to indicate key, value, or null values.  (As of 9.1 it might be better to
  * store null values as nulls, but we'll keep it this way for on-disk
  * compatibility.)
  */
@@ -168,7 +168,7 @@ gin_consistent_hstore(PG_FUNCTION_ARGS)
 	{
 		/*
 		 * Index doesn't have information about correspondence of keys and
-		 * values, so we need recheck.	However, if not all the keys are
+		 * values, so we need recheck.  However, if not all the keys are
 		 * present, we can fail at once.
 		 */
 		*recheck = true;