Try to save a kernel call in ResolveRecoveryConflictWithVirtualXIDs.

If there's no work to be done, just exit quickly, before initialization.

Branch
------
master

Details
-------
http://git.postgresql.org/gitweb?p=postgresql.git;a=commitdiff;h=8bd4b89e240cc6488f5e1523202cc2d27e9970c0

Modified Files
--------------
src/backend/storage/ipc/standby.c |    4 ++++
1 files changed, 4 insertions(+), 0 deletions(-)

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Next:	From: Robert Haas	Date: 2010-12-17 16:34:48
	Subject: Re: [COMMITTERS] pgsql: Reset 'ps' display just once when resolving VXID conflicts.
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