LU-8147 osd-zfs: fix osd_mount error path

LU-8147 osd-zfs: fix osd_mount error path

The osd_oi_fini will grab osl_seq_list_lock for cleanup.
But this lock is not initilized if osd_mount return and
failed before osd_oi_init.

Signed-off-by: Yang Sheng <yang.sheng@intel.com>
Change-Id: I8f76a87e22d131e6ab9034d8ecc42b47e301ff25
Reviewed-on: http://review.whamcloud.com/20309
Tested-by: Jenkins
Reviewed-by: Mike Pershin <mike.pershin@intel.com>
Reviewed-by: John L. Hammond <john.hammond@intel.com>
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>