quota: protect Q_GETFMT by dqonoff_mutex
dqptr_sem will go away. Protect Q_GETFMT quotactl by dqonoff_mutex instead. This is also enough to make sure quota info will not go away while we are looking at it. Signed-off-by: NLai Siyao <lai.siyao@intel.com> Signed-off-by: NNiu Yawei <yawei.niu@intel.com> Signed-off-by: NJan Kara <jack@suse.cz>
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