drm/radeon/kms: rs600: use correct mask for SW interrupt

The mask happens to be the same, but the IH is reading the status, not the
not the control register.

Signed-off-by: Luca Tettamanti <kronos.it@gmail.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
diff --git a/drivers/gpu/drm/radeon/rs600.c b/drivers/gpu/drm/radeon/rs600.c
index 4f8ea42..4245218 100644
--- a/drivers/gpu/drm/radeon/rs600.c
+++ b/drivers/gpu/drm/radeon/rs600.c
@@ -396,7 +396,7 @@
 	}
 	while (status || r500_disp_int) {
 		/* SW interrupt */
-		if (G_000040_SW_INT_EN(status))
+		if (G_000044_SW_INT(status))
 			radeon_fence_process(rdev);
 		/* Vertical blank interrupts */
 		if (G_007EDC_LB_D1_VBLANK_INTERRUPT(r500_disp_int))