Bluetooth: fix error return code in rfcomm_add_listener()
Fix to return a negative error code from the error handling case instead of 0, as returned elsewhere in this function. Signed-off-by: NWei Yongjun <yongjun_wei@trendmicro.com.cn> Signed-off-by: NGustavo Padovan <gustavo.padovan@collabora.co.uk>
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