lustre: don't leak llog handle in llog_cat_process_cb()

An early return from llog_cat_process_cb() was leaking the llog
handle. Fix this by not doing that.

Signed-off-by: John L. Hammond <john.hammond@intel.com>
Reviewed-on: http://review.whamcloud.com/7847
Intel-bug-id: https://jira.hpdd.intel.com/browse/LU-4054


Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>
Reviewed-by: jacques-Charles Lafoucriere <jacques-charles.lafoucriere@cea.fr>
Reviewed-by: Mike Pershin <mike.pershin@intel.com>
Signed-off-by: Oleg Drokin <oleg.drokin@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>