myri10ge fixes

Hi,

The following 2 patches fix the following issues in the myri10ge driver:

#1 - When writing the firmware to the NIC, the FIFO is 256-bytes long, so we use 256-bytes chunks and a read to wait until the previous write is done.
I sent this patch two weeks ago, this new version removes the superfluous second mb().
#2 - Fix spurious invocations of the watchdog reset handler.

Please apply,

Thanks,
Brice Goglin