Convert struct diff_options to use struct pathspec

Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
diff --git a/revision.c b/revision.c
index 7b9eaef..0c511aa 100644
--- a/revision.c
+++ b/revision.c
@@ -553,11 +553,7 @@
 
 	left_first = left_count < right_count;
 	init_patch_ids(&ids);
-	if (revs->diffopt.nr_paths) {
-		ids.diffopts.nr_paths = revs->diffopt.nr_paths;
-		ids.diffopts.paths = revs->diffopt.paths;
-		ids.diffopts.pathlens = revs->diffopt.pathlens;
-	}
+	ids.diffopts.pathspec = revs->diffopt.pathspec;
 
 	/* Compute patch-ids for one side */
 	for (p = list; p; p = p->next) {