Repair breakage in VirtualXactLock.

I broke this in commit 84e37126. Report and fix by Fujii Masao.

Repair breakage in VirtualXactLock.
I broke this in commit 84e37126. Report and fix by Fujii Masao.
e76bcaba · Robert Haas · 5b9102ce · e76bcaba
Commit e76bcaba authored Oct 11, 2011 by Robert Haas
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src/backend/storage/lmgr/lock.c src/backend/storage/lmgr/lock.c +2 -0

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--- a/src/backend/storage/lmgr/lock.c
+++ b/src/backend/storage/lmgr/lock.c
@@ -3675,6 +3675,8 @@ VirtualXactLock(VirtualTransactionId vxid, bool wait)
 	 * it's no longer running anywhere.
 	 */
 	proc = BackendIdGetProc(vxid.backendId);
+	if (proc == NULL)
+		return true;

 	/*
 	 * We must acquire this lock before checking the backendId and lxid