diff.c: fix get_patch_id()
diff.c: fix get_patch_id()

The function internally generated diff to get the patch id but
passed a wrong emit flags to the xdiff layer when it did so.

Signed-off-by: Junio C Hamano <dc50d1021234060e53ec42a77d526afa2fe07479@cox.net>

destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git