bonding: don't cast const buf in sysfs store
As was recently discussed [1], let's avoid casting the const buf in bonding_sysfs_store_option and use kstrndup/kfree instead. [1] http://lists.openwall.net/netdev/2018/07/22/25Signed-off-by: Nikolay Aleksandrov <nikolay@cumulusnetworks.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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