staging: vt6656: iwctl: remove spaces between casts and variables

We do not usually write a space between a cast and the variable being
converted. this patch removes such spaces where they occour in iwctl.c

Signed-off-by: Jesper Juhl <jj@chaosbits.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>