run_external_diff: drop fflush(NULL)
This fflush was added in d5535ec7 (Use run_command() to spawn external diff programs instead of fork/exec., 2007-10-19), because flushing buffers before forking is a good habit. But later, 7d0b18a4 (Add output flushing before fork(), 2008-08-04) added it to the generic run-command interface, meaning that our flush here is redundant. Signed-off-by: NJeff King <peff@peff.net> Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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