staging: vt6656: trivial whitespace cleanups to ioctl.c

This removes a space between a cast and the variable and makes the
case statements in the switch stylewise consistent as to whether
there's a blank line before each 'case' or not.

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