net: Use kmemdup instead of kmalloc and memcpy
when some other buffer is immediately copied into allocated region. Replace calls to kmalloc followed by a memcpy with a direct call to kmemdup. Signed-off-by: NShyam Saini <mayhs11saini@gmail.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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