mISDN: prevent possible NULL pointer dereference
A return value of the bchannel_get_rxbuf() function is compared with the positive ENOMEM value instead of the negative -ENOMEM value to detect a memory allocation problem. Thus, after a possible memory allocation failure the bc->bch.rx_skb will be NULL which will lead to a NULL pointer dereference. Signed-off-by: NAnton Protopopov <a.s.protopopov@gmail.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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