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win32: audio scale fix (thanks Jacob Moody)

--- a/kern/devaudio-win32.c

+++ b/kern/devaudio-win32.c

@@ -54,9 +54,9 @@

 {

 	DWORD v;

-	//Windows uses a 0-255 scale, plan9 uses 0-100

-	v = right*0xFF/100;

-	v = (v<<8)|left*0xFF/100;

+	//Windows uses a 0-0xFFFF scale, plan9 uses 0-100

+	v = right*0xFFFF/100;

+	v = (v<<16)|(left*0xFFFF/100);

 	if(waveOutSetVolume(waveout, v) != MMSYSERR_NOERROR)

 		oserror();

 }

@@ -68,8 +68,8 @@

 	if(waveOutGetVolume(waveout, &v) != MMSYSERR_NOERROR)

 		oserror();

-	*left = (v&0xFF)*100/0xFF;

-	*right = ((v>>8)&0xFF)*100/0xFF;

+	*left = (v&0xFFFF)*100/0xFFFF;

+	*right = ((v>>16)&0xFFFF)*100/0xFFFF;

 }

 int