regex: add many uses of __attribute_warn_unused_result__

[pspp] / ChangeLog

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 2010-01-28  Jim Meyering  <meyering@redhat.com>
 
+       regex: add many uses of __attribute_warn_unused_result__
+       * lib/regex_internal.c: Use __attribute_warn_unused_result__.
+       * lib/regexec.c: Likewise.
+       Extracted from a messy glibc commit.
+
        regcomp.c: spelling and merge-artifact from glibc
        * lib/regcomp.c: Merge remainder of glibc's
        2da42bc06566bc89785e580fa1ac89b4c9f2a63c.