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pc: fix ugly and partially broken switch() statement

--- a/sys/src/9/pc/devarch.c

+++ b/sys/src/9/pc/devarch.c

@@ -758,11 +758,13 @@

 	m->cpuidmodel = m->cpuidax >> 4 & 0xf;

 	m->cpuidstepping = m->cpuidax & 0xf;

 	switch(m->cpuidfamily){

-	case 6:

-		m->cpuidmodel += m->cpuidax >> 16 & 0xf;

-		/* wet floor */

 	case 15:

 		m->cpuidfamily += m->cpuidax >> 20 & 0xff;

+		m->cpuidmodel += m->cpuidax >> 16 & 0xf;

+		break;

+	case 6:

+		m->cpuidmodel += m->cpuidax >> 16 & 0xf;

+		break;

 	}

 	if(strncmp(m->cpuidid, "AuthenticAMD", 12) == 0 ||

-- 

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