transport-helper: release strbuf after use in process_connect_service()

Signed-off-by: Rene Scharfe <l.s.r@web.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

transport-helper.c

@@ -604,6 +604,7 @@ static int process_connect_service(struct transport *transport,
 			cmdbuf.buf);
 
 exit:
+	strbuf_release(&cmdbuf);
 	fclose(input);
 	return ret;
 }