[PATCH] Fix bugcheck in NdisMFreeSharedMemory (happend with 3Com 3C905 TX-M)

The call to NdisMFreeSharedMemory span a thread witch access
Memory->AdapterObject in NdisMFreeSharedMemoryPassive().
But the driver call at next the function NdisMFreeMapRegisters.
In this function Adapter->NdisMiniportBlock.SystemAdapterObject
is freed so the the memory at Memory->AdapterObject is no
longer valid.

This patch call NdisMFreeSharedMemoryPassive direct when
IRQL=PASSIV_LEVEL so that we not need a thread.

Perhapse ther is a better solution but it work on real hardware with
3C905 TX M.

Daniel Zimmermann