staging: rtl8192u: Using function name as string

Solves the following checkpatch.pl for a triggered function:
WARNING: Prefer using '"%s...", __func__' to using 'setKey',
this function's name, in a string

Signed-off-by: Camylla Goncalves Cantanheide <c.cantanheide@gmail.com>
Link: https://lore.kernel.org/r/20200317085130.21213-1-c.cantanheide@gmail.com


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