Staging: xgifb: Removes dead code

xgifb staging driver has code that dependens on XGIfb_accel != 0.
But as Dan Carpenter noticed, XGIfb_accel value is always 0 in current driver.
So there is code that never gets executed.

This patch removes this dead code.

Signed-off-by: Javier Martinez Canillas <martinez.javier@gmail.com>
Acked-by: Dan Carpenter <error27@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>