Move the check for whether walreceiver has authenticated as a superuser

from walsender.c, where it didn't really belong, to postinit.c where it does
belong (and is essentially free, too).

src/backend/replication/walsender.c

@@ -30,7 +30,7 @@
  *
  *
  * IDENTIFICATION
- *	  $PostgreSQL: pgsql/src/backend/replication/walsender.c,v 1.16 2010/04/12 10:18:50 heikki Exp $
+ *	  $PostgreSQL: pgsql/src/backend/replication/walsender.c,v 1.17 2010/04/21 00:51:56 tgl Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -47,13 +47,13 @@
 #include "replication/walsender.h"
 #include "storage/fd.h"
 #include "storage/ipc.h"
-#include "storage/lock.h"
 #include "storage/pmsignal.h"
 #include "tcop/tcopprot.h"
 #include "utils/guc.h"
 #include "utils/memutils.h"
 #include "utils/ps_status.h"
 
+
 /* Array of WalSnds in shared memory */
 WalSndCtlData *WalSndCtl = NULL;
 
@@ -114,11 +114,6 @@ WalSenderMain(void)
 {
 	MemoryContext walsnd_context;
 
-	if (!superuser())
-		ereport(FATAL,
-				(errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
-				 errmsg("must be superuser to start walsender")));
-
 	if (RecoveryInProgress())
 		ereport(FATAL,
 				(errcode(ERRCODE_CANNOT_CONNECT_NOW),