[Bug 207786] gpioiic_callback() dereferences IIC "how" argument incorrectly

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=207786

--- Comment #2 from chadf at triularity.org ---
When will anyone ever pass an address that isn't memory aligned _and_ using the
interface correctly? Any code calling that which doesn't pass the address of an
int (which should be aligned automatically) should be fixed instead of trying
to work around it here.

The only place in the sys code that seems to initiate such a callback (for
IIC_REQUEST_BUS) is iicbus_request_bus() [sys/dev/iicbus/iiconf.c], which
passes the address of an int parameter that is expected to already be aligned.

The function lpbb_callback() [sys/dev/ppbus/lpbb.c] already handles this
properly, presumable without any alignment problems.

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