staging: wfx: remove unneeded spaces

Remove spaces after type casting operators in order to comply codding
standards.
Issue found with checkpatch.

Signed-off-by: Lourdes Pedrajas <lu@pplo.net>
Link: https://lore.kernel.org/r/20200315044922.14249-1-lu@pplo.net


Reviewed-by: Stefano Brivio <sbrivio@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>