drm/xe/pf: Drop the VF VRAM BO reference on successful restore

The reference is only dropped on error. Fix it by adding the missing
xe_bo_put().

Fixes: 49cf1b9b60 ("drm/xe/pf: Handle VRAM migration data as part of PF control")
Reported-by: Adam Miszczak <adam.miszczak@linux.intel.com>
Reviewed-by: Matthew Auld <matthew.auld@intel.com>
Link: https://patch.msgid.link/20251114100713.1776073-1-michal.winiarski@intel.com
Signed-off-by: Michał Winiarski <michal.winiarski@intel.com>

drivers/gpu/drm/xe/xe_gt_sriov_pf_migration.c

@@ -661,6 +661,8 @@ static int pf_restore_vf_vram_mig_data(struct xe_gt *gt, unsigned int vfid,
 		goto err;
 	}
 
+	xe_bo_put(vram);
+
 	return 0;
 err:
 	xe_bo_put(vram);