qeth: refactor calculation of SBALE count
Rewrite the functions that calculate the required number of buffer elements needed to represent SKB data, to make them hopefully more comprehensible. Plus a few cleanups. Signed-off-by: NEugene Crosser <Eugene.Crosser@ru.ibm.com> Signed-off-by: NUrsula Braun <ubraun@linux.vnet.ibm.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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