md: move assignment of ->utime so that it never gets skipped.

Currently the assignment to utime gets skipped for 'external'
metadata.  So move it to the top of the function so that it
always gets effected.
This is of largely cosmetic interest.  Nothing actually depends
on ->utime being right for external arrays.
"mdadm --monitor" does use it for 0.90 and 1.x arrays, but with
mdadm-3.0, this is not important for external metadata.
Signed-off-by: NeilBrown <neilb@suse.de>

drivers/md/md.c

@@ -1904,6 +1904,7 @@ static void md_update_sb(mddev_t * mddev, int force_change)
 	int sync_req;
 	int nospares = 0;
 
+	mddev->utime = get_seconds();
 	if (mddev->external)
 		return;
 repeat:
@@ -1933,7 +1934,6 @@ repeat:
 		nospares = 0;
 
 	sync_req = mddev->in_sync;
-	mddev->utime = get_seconds();
 
 	/* If this is just a dirty<->clean transition, and the array is clean
 	 * and 'events' is odd, we can roll back to the previous clean state */