drm/i915/uc: Cleanup fw fetch only if it was successful

We can rely on firmware status AVAILABLE to determine if any
firmware cleanup is required. Also don't unconditionally reset
fw status to SELECTED as we will loose MISSING/ERROR codes.
Signed-off-by: Michal Wajdeczko <michal.wajdeczko@intel.com>
Cc: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Link: https://patchwork.freedesktop.org/patch/msgid/20190817131144.26884-2-michal.wajdeczko@intel.com

drivers/gpu/drm/i915/gt/uc/intel_uc_fw.c

@@ -559,18 +559,16 @@ void intel_uc_fw_fini(struct intel_uc_fw *uc_fw)
 
 /**
  * intel_uc_fw_cleanup_fetch - cleanup uC firmware
- *
  * @uc_fw: uC firmware
  *
  * Cleans up uC firmware by releasing the firmware GEM obj.
  */
 void intel_uc_fw_cleanup_fetch(struct intel_uc_fw *uc_fw)
 {
-	struct drm_i915_gem_object *obj;
+	if (!intel_uc_fw_is_available(uc_fw))
+		return;
 
-	obj = fetch_and_zero(&uc_fw->obj);
-	if (obj)
-		i915_gem_object_put(obj);
+	i915_gem_object_put(fetch_and_zero(&uc_fw->obj));
 
 	intel_uc_fw_change_status(uc_fw, INTEL_UC_FIRMWARE_SELECTED);
 }