drm/i915: Correctly handle error path in i915_gem_init_hw

In function gem_init_hw() we are calling uc_init_hw() but in case
of error later in function, we missed to call matching uc_fini_hw()

v2: pulled out from the series

Signed-off-by: Michal Wajdeczko <michal.wajdeczko@intel.com>
Cc: Sagar Arun Kamble <sagar.a.kamble@intel.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Sagar Arun Kamble <sagar.a.kamble@intel.com>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Link: https://patchwork.freedesktop.org/patch/msgid/20180605122443.23776-1-michal.wajdeczko@intel.com

drivers/gpu/drm/i915/i915_gem.c

@@ -5286,9 +5286,15 @@ int i915_gem_init_hw(struct drm_i915_private *dev_priv)
 
 	/* Only when the HW is re-initialised, can we replay the requests */
 	ret = __i915_gem_restart_engines(dev_priv);
+	if (ret)
+		goto cleanup_uc;
 out:
 	intel_uncore_forcewake_put(dev_priv, FORCEWAKE_ALL);
 	return ret;
+
+cleanup_uc:
+	intel_uc_fini_hw(dev_priv);
+	goto out;
 }
 
 static int __intel_engines_record_defaults(struct drm_i915_private *i915)