zink: reorder create_stream_output_target to fix failure case leak

the previous version of this leaked a reference to the streamout buffer here

thanks to deltragon on my blog for pointing this out!

Fixes: 37778fcd9a35 ("zink: implement transform feedback support to finish off opengl 3.0")

Reviewed-by: Erik Faye-Lund <erik.faye-lund@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/6457>
1 file changed