Staging: xgifb: Fixed lots of coding style issues.

There were hundreds of warnings and errors given by checkpatch.pl but
now it's down to 20. These ones that were left in the code need some
more attention, cause I reckon the functions are overly nested leading
to a mess of code in a traditional 80 character screen. I'm sure this code
can be refactored into something more visually pleasing (things like
compressing two nested if's into a single if with an AND would help a
lot already).
Signed-off-by: NDaniel Kenji Toyama <kenji.toyama@gmail.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>