drm/i915: precendence bug in GT_PARITY_ERROR()

The | operation has higher precedence than "?:" so the macro always
returns GT_RENDER_L3_PARITY_ERROR_INTERRUPT_S1.

This regression has been introduce in "drm/i915: Add second slice l3
remapping".
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Reviewed-by: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

drivers/gpu/drm/i915/i915_reg.h

@@ -940,7 +940,7 @@
 
 #define GT_PARITY_ERROR(dev) \
 	(GT_RENDER_L3_PARITY_ERROR_INTERRUPT | \
-	 IS_HASWELL(dev) ? GT_RENDER_L3_PARITY_ERROR_INTERRUPT_S1 : 0)
+	 (IS_HASWELL(dev) ? GT_RENDER_L3_PARITY_ERROR_INTERRUPT_S1 : 0))
 
 /* These are all the "old" interrupts */
 #define ILK_BSD_USER_INTERRUPT				(1<<5)