Fix users of prefix_path() to free() only when necessary
Unfortunately, prefix_path() sometimes returns a newly xmalloc()ed buffer, and in other cases it returns a substring! For example, when calling git update-index ./hello.txt prefix_path() returns "hello.txt", but does not allocate a new buffer. The original code only checked if the result of prefix_path() was different from what was passed in, and thusly trigger a segmentation fault. Signed-off-by: NJohannes Schindelin <Johannes.Schindelin@gmx.de> Signed-off-by: NJunio C Hamano <junkio@cox.net>
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