build breakage - port amd64 - hdaudio modules

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

Problems with the modularization of hdaudio stuff

cc1: warnings being treated as errors
/build/netbsd-local/src/sys/dev/pci/hdaudio/hdaudio_afg.c: In function 
'hdafg_modcmd':
/build/netbsd-local/src/sys/dev/pci/hdaudio/hdaudio_afg.c:3852: warning: 
'error' is used uninitialized in this function
*** [hdaudio_afg.o] Error code 1

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