Two coverity non-bugs

Attached is a patch that fixes two non-bugs. There's plenty of
redundant NULL checks around the place but these were just so silly I
figure they're worth fixing.

The first checks 'file' the line after having dereferenced it. The
second checks 'currSchema' where the code is designed to never allow it
to be NULL.

Currently they've fixed the bogus errors relating to elog(), but not yet
the ones relating to ereport(). There's still mountains of crap to wade
through and not a single real bug found yet.

Have a nice day,
--
Martijn van Oosterhout <kleptog(at)svana(dot)org> http://svana.org/kleptog/
> From each according to his ability. To each according to his ability to litigate.