refs.c: abort ref search if ref array is empty
The bsearch() implementation on IRIX 6.5 segfaults if it is passed NULL for the base array argument even if number-of-elements is zero. So, let's work around it by detecting an empty array and aborting early. This is a useful optimization in its own right anyway, since we avoid a useless allocation and initialization of the ref_entry when the ref array is empty. Signed-off-by: NBrandon Casey <casey@nrlssc.navy.mil> Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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