btrfs: use lockdep_assert_held for mutexes
Using lockdep_assert_held is preferred, replace mutex_is_locked.
Signed-off-by: David Sterba <dsterba@suse.com>
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Using lockdep_assert_held is preferred, replace mutex_is_locked.
Signed-off-by: David Sterba <dsterba@suse.com>