drm/vmwgfx: Return -ERESTARTSYS when interrupted by a signal.

Fixes for TTM API change.

Signed-off-by: Thomas Hellstrom <thellstrom@vmware.com>
Signed-off-by: Jakob Bornecrantz <jakob@vmware.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_irq.c b/drivers/gpu/drm/vmwgfx/vmwgfx_irq.c
index 9e0f030..d40086f 100644
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_irq.c
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_irq.c
@@ -155,7 +155,7 @@
 					    TASK_UNINTERRUPTIBLE);
 		}
 		if (interruptible && signal_pending(current)) {
-			ret = -ERESTART;
+			ret = -ERESTARTSYS;
 			break;
 		}
 	}
@@ -218,9 +218,7 @@
 		     vmw_fence_signaled(dev_priv, sequence),
 		     timeout);
 
-	if (unlikely(ret == -ERESTARTSYS))
-		ret = -ERESTART;
-	else if (unlikely(ret == 0))
+	if (unlikely(ret == 0))
 		ret = -EBUSY;
 	else if (likely(ret > 0))
 		ret = 0;