drm/panfrost: Use kvfree() to free bo->sgts

Use kvfree() to free bo->sgts, because the memory is allocated with
kvmalloc_array() in panfrost_mmu_map_fault_addr().

Fixes: 187d2929 ("drm/panfrost: Add support for GPU heap allocations")
Cc: stable@vger.kernel.org
Signed-off-by: Denis Efremov <efremov@linux.com>
Reviewed-by: Steven Price <steven.price@arm.com>
Signed-off-by: Steven Price <steven.price@arm.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200608151728.234026-1-efremov@linux.com

drivers/gpu/drm/panfrost/panfrost_gem.c

@@ -46,7 +46,7 @@ static void panfrost_gem_free_object(struct drm_gem_object *obj)
 				sg_free_table(&bo->sgts[i]);
 			}
 		}
-		kfree(bo->sgts);
+		kvfree(bo->sgts);
 	}
 
 	drm_gem_shmem_free_object(obj);

drivers/gpu/drm/panfrost/panfrost_mmu.c

@@ -486,7 +486,7 @@ static int panfrost_mmu_map_fault_addr(struct panfrost_device *pfdev, int as,
 		pages = kvmalloc_array(bo->base.base.size >> PAGE_SHIFT,
 				       sizeof(struct page *), GFP_KERNEL | __GFP_ZERO);
 		if (!pages) {
-			kfree(bo->sgts);
+			kvfree(bo->sgts);
 			bo->sgts = NULL;
 			mutex_unlock(&bo->base.pages_lock);
 			ret = -ENOMEM;