test-path-utils: Fix off by one, found by valgrind
When normalizing an absolute path, we might have to add a slash _and_ a NUL to the buffer, so the buffer was one too small. Let's just future proof the code and alloc PATH_MAX + 1 bytes. Signed-off-by: NJohannes Schindelin <johannes.schindelin@gmx.de> Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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