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Fix warning in posix/bug-regex31.c.
This patch fixes a "set but not used" warning in posix/bug-regex31.c. A variable res stored an indication of whether the test behaved as expected, but was then ignored and the test returned 0 unconditionally (as an mtrace test, the auxiliary test for leaks could still have failed if that bug was present). This patch makes the test return res. Tested for x86_64. * posix/bug-regex31.c (main): Return RES not 0.
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