xdl_merge(): fix a segmentation fault when refining conflicts
The function xdl_refine_conflicts() tries to break down huge conflicts by doing a diff on the conflicting regions. However, this does not make sense when one side is empty. Worse, when one side is not only empty, but after EOF, the code accessed unmapped memory. Noticed by Luben Tuikov, Shawn Pearce and Alexandre Julliard, the latter providing a test case. Signed-off-by: NJohannes Schindelin <Johannes.Schindelin@gmx.de> Signed-off-by: NJunio C Hamano <junkio@cox.net>
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