cocci: apply the "cache.h" part of "the_repository.pending"

Apply the part of "the_repository.pending.cocci" pertaining to
"cache.h".

Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
diff --git a/combine-diff.c b/combine-diff.c
index 1a39b5d..d84ab87 100644
--- a/combine-diff.c
+++ b/combine-diff.c
@@ -948,11 +948,11 @@ static void show_combined_header(struct combine_diff_path *elem,
 			 "", elem->path, line_prefix, c_meta, c_reset);
 	printf("%s%sindex ", line_prefix, c_meta);
 	for (i = 0; i < num_parent; i++) {
-		abb = find_unique_abbrev(&elem->parent[i].oid,
-					 abbrev);
+		abb = repo_find_unique_abbrev(the_repository,
+					      &elem->parent[i].oid, abbrev);
 		printf("%s%s", i ? "," : "", abb);
 	}
-	abb = find_unique_abbrev(&elem->oid, abbrev);
+	abb = repo_find_unique_abbrev(the_repository, &elem->oid, abbrev);
 	printf("..%s%s\n", abb, c_reset);
 
 	if (mode_differs) {