e100: Fix ring parameter change handling regression.

e100: Fix ring parameter change handling regression.

When the PCI pool changes were added to fix resume failures:

commit ac495cde63981b97386d586257e721545bc10b11
e100: Use pci pool to work around GFP_ATOMIC order 5 memory allocation failu

and

commit b9a76b13fcf80804f0cc29898e6fed5dd3ca2316
e100: Fix broken cbs accounting due to missing memset.

This introduced a problem that can happen if the TX ring size
is increased.  We need to size the PCI pool using cbs->max
instead of the default cbs->count value.

Signed-off-by: David S. Miller <davem@davemloft.net>