mss.c pcm fix to ' attach returned 6 ' load failure for v5.x acpi and up

[Harry Coin]

Warner,

Seems you've got it all surrounded, save for this I didn't see a comment upon:

We have: 
http://www.freebsd.org/doc/en_US.ISO8859-1/books/arch-handbook/isa-driver-config.html
...That means that absolutely every driver, even the ones not supporting 
any PnP devices must call ISA_PNP_PROBE(), at least with an empty PnP ID 
table to return failure on unknown PnP devices....

Which is not the case in mss.c and from John's comments many other non-pnp 
isa drivers.  Seems a project to either fix the doc or the drivers.

Harry