btrfs: Use PTR_ERR_OR_ZERO
PTR_RET is deprecated. Use PTR_ERR_OR_ZERO instead. While at it also include missing err.h header. Signed-off-by: NSachin Kamat <sachin.kamat@linaro.org> Signed-off-by: NJosef Bacik <jbacik@fb.com>
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