Avoid possible dereference null pointer (src/backend/utils/cache/relcache.c)

[Ranier Vilela]

Hi.

The function *ScanPgRelation* can return a invalid tuple.
It is necessary to check the function's return,
as is already done in other parts of the source.

patch attached.

Best regards,
Ranier Vilela

fix-possible-dereference-null-pointer-relcache.patch
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