vol_split: Recover from stream open failure

vol_split: Recover from stream open failure

Make sure we go through the error recovery code when we can't create a
stream, instead of just returning without cleaning up.

Change-Id: Ie3a5be9a81b36624a7d49958233c42e82a0e4bfa
Reviewed-on: http://gerrit.openafs.org/3466
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Jeffrey Altman <jaltman@openafs.org>
Reviewed-by: Derrick Brashear <shadow@dementia.org>
Tested-by: Derrick Brashear <shadow@dementia.org>