isdn/kcapi: fix a small underflow
In get_capi_ctr_by_nr() and get_capi_appl_by_nr() the parameter comes from skb->data. The current code can underflow to one space before the start of the array. The sanity check isn't needed in __get_capi_appl_by_nr() but I changed it to match the others. Signed-off-by: NDan Carpenter <dan.carpenter@oracle.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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