Staging: xgifb: Fixed style issues.

Not all warnings/errors were silenced, some of them are related to
simple printk() messages that imho should not be split across multiple
lines (it makes it harder to grep for example), and some of them are
related to long lines that are pretty much impossible to split without
proper code refactoring.

Resubmitting this patch because of conflicts.
Signed-off-by: Daniel Kenji Toyama <kenji.toyama@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>