prefix_filename(): safely handle the case where pfx_len=0
Current prefix_filename() is proofed against the case where the prefix 'pfx' is NULL or a 0-length string, _except on Windows_. Change the behaviour to work the same on both platforms, and only check pfx_len so that callers passing a NULL prefix with a nonzero pfx_len segfault early on both. Signed-off-by: NThomas Rast <trast@student.ethz.ch> Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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