checking return value from unlink in write_relcache_init_file

[Zhihong Yu]

Hi,
I was looking at write_relcache_init_file() where an attempt is made to
unlink the tempfilename.

However, the return value is not checked.
If the tempfilename is not removed (the file exists), I think we should log
a warning and proceed.

Please comment on the proposed patch.

Thanks

check-unlink-return-init-file.patch
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