md: remove typedefs: mdk_thread_t -> struct md_thread

Signed-off-by: NeilBrown <neilb@suse.de>
diff --git a/drivers/md/raid1.h b/drivers/md/raid1.h
index b6bc7b1..07e9cb9 100644
--- a/drivers/md/raid1.h
+++ b/drivers/md/raid1.h
@@ -92,7 +92,7 @@
 	/* When taking over an array from a different personality, we store
 	 * the new thread here until we fully activate the array.
 	 */
-	struct mdk_thread_s	*thread;
+	struct md_thread	*thread;
 };
 
 typedef struct r1_private_data_s conf_t;