[PATCH] fix bdrv_open_child return value check

[Dmitry Frolov]

bdrv_open_child() may return NULL.
Usually return value is checked for this function.
Check for return value is more reliable.

Fixes: 24bc15d1f6 ("vmdk: Use BdrvChild instead of BDS for references to 
extents")

Signed-off-by: Dmitry Frolov <frolov@swemel.ru>
---
 block/vmdk.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/block/vmdk.c b/block/vmdk.c
index 70066c2b01..58ce290e9c 100644
--- a/block/vmdk.c
+++ b/block/vmdk.c
@@ -1207,7 +1207,7 @@ static int vmdk_parse_extents(const char *desc, 
BlockDriverState *bs,
                                       bs, &child_of_bds, extent_role, false,
                                       &local_err);
         g_free(extent_path);
-        if (local_err) {
+        if (!extent_file) {
             error_propagate(errp, local_err);
             ret = -EINVAL;
             goto out;
-- 
2.34.1