hfsplus: convert tree_lock to mutex
tree_lock is used as mutex so make it a mutex. Signed-off-by: NThomas Gleixner <tglx@linutronix.de> Signed-off-by: NChristoph Hellwig <hch@tuxera.com>
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tree_lock is used as mutex so make it a mutex. Signed-off-by: NThomas Gleixner <tglx@linutronix.de> Signed-off-by: NChristoph Hellwig <hch@tuxera.com>