[File] [PATCH] Merge file_regerror into file_regcomp

[Dirk Müller]

Only regcomp() can return an error, regexec() only returns match or
no-match. This allows to merge file_regerror into file_regcomp and
thereby simplifies the callers of file_regcomp() as they no longer
need to handle errors. Also this reduces memory overhead slightly
as we can make file_regex_t directly a regex_t, saving ~ 16 bytes per
regex.
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