Cherry-pick upstream commit 727b493e to address FTBFS on mips64el

Michael Prokoprequested to merge
mika/mips64el into debian

Description from upstream:

50736: silence use-after-free warning (gcc-12.2)

And as noted by @zeha, the patch fixes a memory issue in compmatch.c, gcc indeed complains about that, so this hopefully fixes our FTBFS issue on mips64el.

Thanks: Chris Hofstaedtler zeha@debian.org Closes: #1078749

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