staging: lustre: lov: use correct env in lov_io_data_version_end()

lov - the logical object volume manager - is responsible for
striping data across multiple volumes.

So when it is given a request, it creates one or more
sub-requests, one for each target volume.  Each sub_io
request has a sub_env environment which it operates in.

When lov_io_data_version_end() calls lov_io_end_wrapper() to
wait for and close off a sub_io, it passes the wrong
environment.

This causes an LINVRNT() to fail in cl2osc_io(), and may
cause other problems.

This patch changes the call to use ->sub_env, much like
other code in the same file.

Fixes: f0cf21ab ("staging: lustre: clio: add CIT_DATA_VERSION and remove IOC_LOV_GETINFO")
Signed-off-by: NeilBrown <neilb@suse.com>
Reviewed-by: James Simmons <jsimmons@infradead.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/lustre/lustre/lov/lov_io.c

@@ -483,7 +483,7 @@ lov_io_data_version_end(const struct lu_env *env, const struct cl_io_slice *ios)
 	struct lov_io_sub *sub;
 
 	list_for_each_entry(sub, &lio->lis_active, sub_linkage) {
-		lov_io_end_wrapper(env, sub->sub_io);
+		lov_io_end_wrapper(sub->sub_env, sub->sub_io);
 
 		parent->u.ci_data_version.dv_data_version +=
 			sub->sub_io->u.ci_data_version.dv_data_version;