ocfs2: cleanup return value and mlog in ocfs2_global_read_info()

Return 0 instead of sizeof(ocfs2_global_disk_dqinfo) that .quota_read
returns in normal case.  Also cleanup mlog to make code more readable.

Link: https://lkml.kernel.org/r/20240904071004.2067695-2-joseph.qi@linux.alibaba.com


Signed-off-by: Joseph Qi <joseph.qi@linux.alibaba.com>
Reviewed-by: Heming Zhao <heming.zhao@suse.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: Gang He <ghe@suse.com>
Cc: Jun Piao <piaojun@huawei.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>