pgsql: Fix creative, but unportable, spelling of "ptr != NULL".

Fix creative, but unportable, spelling of "ptr != NULL".

Or at least I suppose that's what was really meant here. But even
aside from the not-per-project-style use of "0" to mean "NULL",
I doubt it's safe to assume that all valid pointers are > NULL.
Per buildfarm member pademelon.

Branch
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master

Details
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http://git.postgresql.org/pg/commitdiff/563d575fd73361f6118c13f2816988eba8e1f657

Modified Files
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src/backend/commands/tablecmds.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

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