staging: xgifb: Removed an unnecessary assignment statement

Used coccinelle patch
@@

expression data;
identifier f;

@@

-data =
+return
     f(...);
-return (data);

Signed-off-by: Sarah Khan <sarahjmi07@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>