Revert "Ignore walsender slots that are not currently used in gp_replica_check."

This reverts commit 3214d80fabf7c208e40b2ec4f7ec69c97a9e7dd6.

contrib/gp_replica_check/gp_replica_check.c

@@ -217,11 +217,8 @@ sync_wait(void)
 		LWLockAcquire(SyncRepLock, LW_SHARED);
 		for (i = 0; i < max_wal_senders; i++)
 		{
-			/* Ignore standbys that are not connected at the moment */
-			if (WalSndCtl->walsnds[i].pid == 0)
-				continue;
-
-			if (WalSndCtl->walsnds[i].state != WALSNDSTATE_STREAMING
+			if (WalSndCtl->walsnds[i].pid == 0
+				|| WalSndCtl->walsnds[i].state != WALSNDSTATE_STREAMING
 				|| !XLByteLE(ckpt_lsn, WalSndCtl->walsnds[i].apply))
 				break;
 		}