find_first_merges(): initialize merges variable using initializer

Signed-off-by: Michael Haggerty <mhagger@alum.mit.edu>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

submodule.c

@@ -846,7 +846,7 @@ static int find_first_merges(struct object_array *result, const char *path,
 		struct commit *a, struct commit *b)
 {
 	int i, j;
-	struct object_array merges;
+	struct object_array merges = OBJECT_ARRAY_INIT;
 	struct commit *commit;
 	int contains_another;
 
@@ -856,7 +856,6 @@ static int find_first_merges(struct object_array *result, const char *path,
 	struct rev_info revs;
 	struct setup_revision_opt rev_opts;
 
-	memset(&merges, 0, sizeof(merges));
 	memset(result, 0, sizeof(struct object_array));
 	memset(&rev_opts, 0, sizeof(rev_opts));