staging: fsl-dpaa2/ethsw: fix memory leak of switchdev_work

In the default event case switchdev_work is being leaked because
nothing is queued for work. Fix this by kfree'ing switchdev_work
before returning NOTIFY_DONE.

Addresses-Coverity: ("Resource leak")
Fixes: 44baaa43d7cc ("staging: fsl-dpaa2/ethsw: Add Freescale DPAA2 Ethernet Switch driver")
Signed-off-by: Colin Ian King <[e-mail]>
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

drivers/staging/fsl-dpaa2/ethsw/ethsw.c

···
 		dev_hold(dev);
 		break;
 	default:
+		kfree(switchdev_work);
 		return NOTIFY_DONE;
 	}