md: changed the switch of RAID_VERSION to if

There is only one case of this 'switch'. Change it to 'if'.

Signed-off-by: Li Nan <[email protected]>
Signed-off-by: Song Liu <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

Author: Li Nan

drivers/md/md.c

@@ -7613,12 +7613,8 @@ static int md_ioctl(struct block_device *bdev, blk_mode_t mode,
 	 * Commands dealing with the RAID driver but not any
 	 * particular array:
 	 */
-	switch (cmd) {
-	case RAID_VERSION:
-		err = get_version(argp);
-		goto out;
-	default:;
-	}
+	if (cmd == RAID_VERSION)
+		return get_version(argp);
 
 	/*
 	 * Commands creating/starting a new array: