Merge branch 'oom_fixes'

Florian Fainelli says:

====================
net: systemport and bcmgenet OOM fixes

These two patches fix similar Out of Memory code paths in the SYSTEMPORT and
GENET drivers. Under high memory pressure, we could produce an OOPS by
passing a NULL pointer to dma_unmap_single().
====================

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