ocfs2: remove unused errmsg function and table

ocfs2: remove unused errmsg function and table

dlm_errmsg() has been unused since 2010's commit 0016eedc4185
("ocfs2_dlmfs: Use the stackglue.")

Remove dlm_errmsg() and the message table it indexes.

Link: https://lkml.kernel.org/r/20241022002543.302606-1-linux@treblig.org
Signed-off-by: Dr. David Alan Gilbert <linux@treblig.org>
Acked-by: Joseph Qi <joseph.qi@linux.alibaba.com>
Cc: Mark Fasheh <mark@fasheh.com>
Cc: Joel Becker <jlbec@evilplan.org>
Cc: Junxiao Bi <junxiao.bi@oracle.com>
Cc: Changwei Ge <gechangwei@live.cn>
Cc: Jun Piao <piaojun@huawei.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>