[File] [PATCH] regex handling in file_regfree

[Steve Grubb]

Hello,

I noticed a small cleanup-safety issue around regex handling:
file_regfree() always calls regfree().

In two places, file_replace() and check_fmt(), cleanup was unconditional even 
when file_regcomp() returned non-zero.

Since file_regcomp() can return an error, those paths can pass a regex object 
that was not successfully compiled into regfree(). Calling regfree() on a 
non-successfully-compiled regex is undefined behavior and can crash on some 
libc implementations. 

This patch just makes cleanup conditional on rc == 0 at those two call sites, 
with no API/structure changes.

Behavior is otherwise unchanged.
-Steve
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