ocfs2: avoid extra calls to strlen() after ocfs2_sprintf_system_inode_name()

Since 'ocfs2_sprintf_system_inode_name()' uses 'snprintf()' and returns
the number of characters emitted, callers of the former are better to use
that return value instead of an explicit calls to 'strlen()'.

Link: https://lkml.kernel.org/r/20250917060229.1854335-1-dmantipov@yandex.ru


Signed-off-by: Dmitry Antipov <dmantipov@yandex.ru>
Reviewed-by: Joseph Qi <joseph.qi@linux.alibaba.com>
Reviewed-by: Joel Becker <jlbec@evilplan.org>
Cc: Mark Fasheh <mark@fasheh.com>
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>