staging:rtl8192u: Clear error with line ending ( - Style

Rewrite function call to clear the checkpatch issue with lines ending
with a '(' character.

This is a coding style change which should have no impact on runtime
code execution.

Signed-off-by: John Whitmore <johnfwhitmore@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>