Staging: xgifb: Remove unused spinlock in struct video_info

xgifb framebuffer driver had an option to use an accelerator engine that never
got used (XGIfb_accel was always 0).

An earlier patchset removed the code relevant to the accelerator.
Since this spinlock was used only for that code, it can be deleted as well.
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>

drivers/staging/xgifb/XGIfb.h

 #ifndef _LINUX_XGIFB
 #define _LINUX_XGIFB
-#include <linux/spinlock.h>
 #include <asm/ioctl.h>
 #include <asm/types.h>
 
@@ -190,8 +189,6 @@ struct video_info{
         unsigned long  XGI310_AccelDepth;
         unsigned long  CommandReg;
 
-        spinlock_t     lockaccel;
-
         unsigned int   pcibus;
         unsigned int   pcislot;
         unsigned int   pcifunc;