IB/iSER bugfixes

Hi,

While reading through the iSER code I noticed two rather nasty issues:

1. The iteration through the list of "iser_device"s during device lookup/creation is broken - it might result in an infinite loop if more than 1 HCA is used with iSER. Use list_for_each_entry() instead of the custom, flawed list iteration code.

2. "iser_device" allocation failure is "handled" with a BUG_ON() right before dereferencing the NULL-pointer.
This is really scary, so here's my idea of a fix. Someone with a deeper understanding of the code should have a look at it since I'm not sure it does The Right Thing.

Both patches are merely compile tested, and patch #2 needs to be applied on top of #1.

Cheers,
Arne