amd64 build break

[Paul Goyette <paul%whooppee.com@localhost>]

On a kernel which does NOT have DEBUG or DIAGNOSTIC, I am getting the 
following compile error:

/build/netbsd-local/src/sys/dev/pci/agp_i810.c: In function 
'agp_i810_unbind_memory':
/build/netbsd-local/src/sys/dev/pci/agp_i810.c:1368:25: error: unused variable 
'isc' [-Werror=unused-variable]
  struct agp_i810_softc *isc = sc->as_chipc;

It seems that the only reference to isc is in the KASSERT() at line 1378 
which doesn't do anything unless DEBUG is defined!

:)


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