Staging: rtl8192u: ieee80211: Use netdev_alert().

Replace printk(KERN_ALERT ...) with netdev_alert()
when a network device is available.

Signed-off-by: Sam Muhammed <jane.pnx9@gmail.com>
Link: https://lore.kernel.org/r/70e8781cd2a9512cb6b3c42400a10323f3024f3c.1585233434.git.jane.pnx9@gmail.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>