xfs: fix scrub trace with null pointer in quotacheck

The quotacheck doesn't initialize sc->ip.

Cc: stable@vger.kernel.org # v6.8
Fixes: 21d7500 ("xfs: improve dquot iteration for scrub")
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
Signed-off-by: Andrey Albershteyn <aalbersh@kernel.org>
Signed-off-by: Carlos Maiolino <cem@kernel.org>

Author: alberand

fs/xfs/scrub/trace.h

@@ -479,7 +479,7 @@ DECLARE_EVENT_CLASS(xchk_dqiter_class,
 		__field(xfs_exntst_t, state)
 	),
 	TP_fast_assign(
-		__entry->dev = cursor->sc->ip->i_mount->m_super->s_dev;
+		__entry->dev = cursor->sc->mp->m_super->s_dev;
 		__entry->dqtype = cursor->dqtype;
 		__entry->ino = cursor->quota_ip->i_ino;
 		__entry->cur_id = cursor->id;