vgaarb: fix signal handling in vga_get()

There are few defects in vga_get() related to signal hadning:

- we shouldn't check for pending signals for TASK_UNINTERRUPTIBLE
case;

- if we found pending signal we must remove ourself from wait queue
and change task state back to running;

- -ERESTARTSYS is more appropriate, I guess.

Signed-off-by: Kirill A. Shutemov <[e-mail]>
Cc: [e-mail]
Reviewed-by: David Herrmann <[e-mail]>
Signed-off-by: Dave Airlie <[e-mail]>

drivers/gpu/vga/vgaarb.c

···
 		set_current_state(interruptible ?
 				  TASK_INTERRUPTIBLE :
 				  TASK_UNINTERRUPTIBLE);
-		if (signal_pending(current)) {
-			rc = -EINTR;
+		if (interruptible && signal_pending(current)) {
+			__set_current_state(TASK_RUNNING);
+			remove_wait_queue(&vga_wait_queue, &wait);
+			rc = -ERESTARTSYS;
 			break;
 		}
 		schedule();