Staging: rtl8192u: use %s and __func__

Change function's name to %s and __func__ to fix checkpatch.pl errors.

Signed-off-by: Puranjay Mohan <puranjay12@gmail.com>
Link: https://lore.kernel.org/r/20210124144328.121688-1-puranjay12@gmail.com


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