submodule--helper: remove repeated code in sync_submodule()

This part of `sync_submodule()` is doing the same thing that
`compute_submodule_clone_url()` is doing. Let's reuse that helper here.

Note that this change adds a small overhead where we allocate and free
the 'remote' twice, but that is a small price to pay for the higher
level of abstraction we get.

Signed-off-by: Atharva Raykar <[email protected]>
Mentored-by: Christian Couder <[email protected]>
Mentored-by: Shourya Shukla <[email protected]>
Signed-off-by: Junio C Hamano <[email protected]>

Author: tfidfwastaken

builtin/submodule--helper.c

@@ -1373,20 +1373,10 @@ static void sync_submodule(const char *path, const char *prefix,
 	if (sub && sub->url) {
 		if (starts_with_dot_dot_slash(sub->url) ||
 		    starts_with_dot_slash(sub->url)) {
-			char *remote_url, *up_path;
-			char *remote = get_default_remote();
-			strbuf_addf(&sb, "remote.%s.url", remote);
-
-			if (git_config_get_string(sb.buf, &remote_url))
-				remote_url = xgetcwd();
-
-			up_path = get_up_path(path);
-			sub_origin_url = relative_url(remote_url, sub->url, up_path);
-			super_config_url = relative_url(remote_url, sub->url, NULL);
-
-			free(remote);
+			char *up_path = get_up_path(path);
+			sub_origin_url = compute_submodule_clone_url(sub->url, up_path, 1);
+			super_config_url = compute_submodule_clone_url(sub->url, NULL, 1);
 			free(up_path);
-			free(remote_url);
 		} else {
 			sub_origin_url = xstrdup(sub->url);
 			super_config_url = xstrdup(sub->url);