drm/xe: Check result of drmm_mutex_init()

Although it's unlikely that drmm_mutex_init() will fail during
driver initialization, however we shouldn't ignore this case.
Signed-off-by: Michal Wajdeczko <michal.wajdeczko@intel.com>
Reviewed-by: Himal Prasad Ghimiray <himal.prasad.ghimiray@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240409153132.1111-1-michal.wajdeczko@intel.comSigned-off-by: Lucas De Marchi <lucas.demarchi@intel.com>

drivers/gpu/drm/xe/xe_device.c

@@ -274,7 +274,10 @@ struct xe_device *xe_device_create(struct pci_dev *pdev,
 
 	init_waitqueue_head(&xe->ufence_wq);
 
-	drmm_mutex_init(&xe->drm, &xe->usm.lock);
+	err = drmm_mutex_init(&xe->drm, &xe->usm.lock);
+	if (err)
+		goto err;
+
 	xa_init_flags(&xe->usm.asid_to_vm, XA_FLAGS_ALLOC);
 
 	if (IS_ENABLED(CONFIG_DRM_XE_DEBUG)) {