LU-8685 kernel: jbd2: fix incorrect unlock on j_list_lock

LU-8685 kernel: jbd2: fix incorrect unlock on j_list_lock

This patch has been back-ported to avoid kernel Oopses/BUG()s
due to j_list_lock found unlocked when expected to be locked!

In jbd2_journal_get_create_access(),
when 'jh->b_transaction == transaction' (asserted by below)

  J_ASSERT_JH(jh, (jh->b_transaction == transaction || ...

'journal->j_list_lock' will be incorrectly unlocked, since
the the lock is aquired only at the end of if / else-if
statements (missing the else case).

This bug has been introduced by an earlier change named
"jbd2: minimize region locked by j_list_lock in
journal_get_create_access()".

Signed-off-by: Taesoo Kim <tsgatesv@gmail.com>
Signed-off-by: Bruno Faccini <bruno.faccini@intel.com>
Change-Id: Ifb8b038333e523caa1b274f53f49317182895de5
Reviewed-on: http://review.whamcloud.com/23050
Tested-by: Jenkins
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>
Reviewed-by: Bob Glossman <bob.glossman@intel.com>
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Niu Yawei <yawei.niu@intel.com>
Reviewed-by: Wang Shilong <wshilong@ddn.com>