get_importer: use run-command's internal argv_array

This saves a few lines and lets us avoid having to clean up
the memory manually when the command finishes.

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

transport-helper.c

@@ -394,18 +394,16 @@ static int get_importer(struct transport *transport, struct child_process *fasti
 {
 	struct child_process *helper = get_helper(transport);
 	struct helper_data *data = transport->data;
-	struct argv_array argv = ARGV_ARRAY_INIT;
 	int cat_blob_fd, code;
 	memset(fastimport, 0, sizeof(*fastimport));
 	fastimport->in = helper->out;
-	argv_array_push(&argv, "fast-import");
-	argv_array_push(&argv, debug ? "--stats" : "--quiet");
+	argv_array_push(&fastimport->args, "fast-import");
+	argv_array_push(&fastimport->args, debug ? "--stats" : "--quiet");
 
 	if (data->bidi_import) {
 		cat_blob_fd = xdup(helper->in);
-		argv_array_pushf(&argv, "--cat-blob-fd=%d", cat_blob_fd);
+		argv_array_pushf(&fastimport->args, "--cat-blob-fd=%d", cat_blob_fd);
 	}
-	fastimport->argv = argv.argv;
 	fastimport->git_cmd = 1;
 
 	code = start_command(fastimport);
@@ -476,7 +474,6 @@ static int fetch_with_import(struct transport *transport,
 
 	if (finish_command(&fastimport))
 		die("Error while running fast-import");
-	argv_array_free_detached(fastimport.argv);
 
 	/*
 	 * The fast-import stream of a remote helper that advertises