drm/xe: Simplify final return from xe_irq_install()

At the end of the function, we will always return err no matter it's
value. Simplify this by just returning the result of
drmm_add_action_or_reset().

Reviewed-by: Matt Roper <matthew.d.roper@intel.com>
Link: https://lore.kernel.org/r/20230915220233.59736-1-gustavo.sousa@intel.com
Signed-off-by: Gustavo Sousa <gustavo.sousa@intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>

drivers/gpu/drm/xe/xe_irq.c

@@ -592,11 +592,7 @@ int xe_irq_install(struct xe_device *xe)
 
 	xe_irq_postinstall(xe);
 
-	err = drmm_add_action_or_reset(&xe->drm, irq_uninstall, xe);
-	if (err)
-		return err;
-
-	return err;
+	return drmm_add_action_or_reset(&xe->drm, irq_uninstall, xe);
 }
 
 void xe_irq_shutdown(struct xe_device *xe)