macvtap: remove useless codes in macvtap_aio_read() and macvtap_recvmsg()
By checking related codes, it is impossible that ret > len or total_len, so we should remove some useless coeds in both above functions. Signed-off-by: NZhi Yong Wu <wuzhy@linux.vnet.ibm.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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