Avoid possible memory leak (src/common/rmtree.c)

[Ranier Vilela]

Hi,

Per Coverity.

rmtree function can leak 64 bytes per call,
when it can't open a directory.

patch attached.

best regards,
Ranier Vilela

0003-Avoid-possible-memory-leak-64-bytes-per-rmtree-call-.patch
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