md: fix semicolon.cocci warnings

drivers/md/md.c:7175:43-44: Unneeded semicolon

 Removes unneeded semicolon.

Generated by: scripts/coccinelle/misc/semicolon.cocci

Signed-off-by: Fengguang Wu <fengguang.wu@intel.com>
Signed-off-by: NeilBrown <neilb@suse.de>
diff --git a/drivers/md/md.c b/drivers/md/md.c
index 9233c71..ad5d783 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -6969,7 +6969,7 @@
 	int mask;
 
 	if (md_unloading)
-		return POLLIN|POLLRDNORM|POLLERR|POLLPRI;;
+		return POLLIN|POLLRDNORM|POLLERR|POLLPRI;
 	poll_wait(filp, &md_event_waiters, wait);
 
 	/* always allow read */