IB: Fix return value in ib_device_register_sysfs()
If kobject_create_and_add() fails and returns NULL, the current code in ib_device_register_sysfs() does not set ret and hence returns 0. Set ret to -ENOMEM for this failure, so that the caller knows that ib_device_register_sysfs() actually failed. Signed-off-by: NLi Zefan <lizf@cn.fujitsu.com> Signed-off-by: NRoland Dreier <rolandd@cisco.com>
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