dm ioctl: fix a couple ioctl codes

Change the ioctl codes from DM_DEV_ARM_POLL to DM_DEV_ARM_POLL_CMD and
from DM_GET_TARGET_VERSION to DM_GET_TARGET_VERSION_CMD.

Note that the "cmd" field of "struct _ioctls" is never used, thus this
commit doesn't fix any bug, it just makes the code consistent.
Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@kernel.org>

drivers/md/dm-ioctl.c

@@ -1788,8 +1788,8 @@ static ioctl_fn lookup_ioctl(unsigned int cmd, int *ioctl_flags)
 
 		{DM_TARGET_MSG_CMD, 0, target_message},
 		{DM_DEV_SET_GEOMETRY_CMD, 0, dev_set_geometry},
-		{DM_DEV_ARM_POLL, IOCTL_FLAGS_NO_PARAMS, dev_arm_poll},
-		{DM_GET_TARGET_VERSION, 0, get_target_version},
+		{DM_DEV_ARM_POLL_CMD, IOCTL_FLAGS_NO_PARAMS, dev_arm_poll},
+		{DM_GET_TARGET_VERSION_CMD, 0, get_target_version},
 	};
 
 	if (unlikely(cmd >= ARRAY_SIZE(_ioctls)))