[PATCH] diff: fix the culling of unneeded delete record.

[PATCH] diff: fix the culling of unneeded delete record.

The commit 15d061b435a7e3b6bead39df3889f4af78c4b00a

    [PATCH] Fix the way diffcore-rename records unremoved source.

still leaves unneeded delete records in its output stream by
mistake, which was covered up by having an extra check to turn
such a delete into a no-op downstream.  Fix the check in the
diffcore-rename to simplify the output routine.

Signed-off-by: Junio C Hamano <junkio@cox.net>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>