staging: wfx: Remove local variable used only in return statement.

Remove unnecessary local variable that is used in return statement and
return the expression directly. Issue found using coccinelle.

Signed-off-by: Nachammai Karuppiah <nachukannan@gmail.com>
Link: https://lore.kernel.org/r/1572945691-109992-1-git-send-email-nachukannan@gmail.com


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