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

src/backend/replication/syncrep.c

@@ -522,7 +522,7 @@ SyncRepGetStandbyPriority(void)
 }
 
 /*
- * Walk the specified queue from head.	Set the state of any backends that
+ * Walk the specified queue from head.  Set the state of any backends that
  * need to be woken, remove them from the queue, and then wake them.
  * Pass all = true to wake whole queue; otherwise, just wake up to
  * the walsender's LSN.

src/backend/replication/walreceiver.c

@@ -228,7 +228,7 @@ WalReceiverMain(void)
 
 	/*
 	 * If possible, make this process a group leader, so that the postmaster
-	 * can signal any child processes too.	(walreceiver probably never has
+	 * can signal any child processes too.  (walreceiver probably never has
 	 * any child processes, but for consistency we make all postmaster child
 	 * processes do this.)
 	 */
@@ -413,7 +413,7 @@ WalRcvQuickDieHandler(SIGNAL_ARGS)
 	on_exit_reset();
 
 	/*
-	 * Note we do exit(2) not exit(0).	This is to force the postmaster into a
+	 * Note we do exit(2) not exit(0).  This is to force the postmaster into a
 	 * system reset cycle if some idiot DBA sends a manual SIGQUIT to a random
 	 * backend.  This is necessary precisely because we don't clean up our
 	 * shared memory state.  (The "dead man switch" mechanism in pmsignal.c

src/backend/replication/walreceiverfuncs.c

@@ -221,7 +221,7 @@ RequestXLogStreaming(XLogRecPtr recptr, const char *conninfo)
  * Returns the last+1 byte position that walreceiver has written.
  *
  * Optionally, returns the previous chunk start, that is the first byte
- * written in the most recent walreceiver flush cycle.	Callers not
+ * written in the most recent walreceiver flush cycle.  Callers not
  * interested in that value may pass NULL for latestChunkStart.
  */
 XLogRecPtr

src/backend/replication/walsender.c

@@ -695,7 +695,7 @@ ProcessStandbyHSFeedbackMessage(void)
 	 * far enough to make reply.xmin wrap around.  In that case the xmin we
 	 * set here would be "in the future" and have no effect.  No point in
 	 * worrying about this since it's too late to save the desired data
-	 * anyway.	Assuming that the standby sends us an increasing sequence of
+	 * anyway.  Assuming that the standby sends us an increasing sequence of
 	 * xmins, this could only happen during the first reply cycle, else our
 	 * own xmin would prevent nextXid from advancing so far.
 	 *
@@ -1357,7 +1357,7 @@ WalSndQuickDieHandler(SIGNAL_ARGS)
 	on_exit_reset();
 
 	/*
-	 * Note we do exit(2) not exit(0).	This is to force the postmaster into a
+	 * Note we do exit(2) not exit(0).  This is to force the postmaster into a
 	 * system reset cycle if some idiot DBA sends a manual SIGQUIT to a random
 	 * backend.  This is necessary precisely because we don't clean up our
 	 * shared memory state.  (The "dead man switch" mechanism in pmsignal.c