drivers/block/mg_disk.c: make mg_times_out() static

mg_times_out() is used only in this file.  Fix the following sparse
warning:

  drivers/block/mg_disk.c:639:6: warning: symbol 'mg_times_out' was not declared. Should it be static?
Signed-off-by: NJingoo Han <jg1.han@samsung.com>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

drivers/block/mg_disk.c

@@ -636,7 +636,7 @@ static void mg_write_intr(struct mg_host *host)
 		mg_request(host->breq);
 }
 
-void mg_times_out(unsigned long data)
+static void mg_times_out(unsigned long data)
 {
 	struct mg_host *host = (struct mg_host *)data;
 	char *name;