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aux/cpuid: make sure extended feature bits are available (fixes crash on the pentium II)

--- a/sys/src/cmd/aux/cpuid.c

+++ b/sys/src/cmd/aux/cpuid.c

@@ -246,6 +246,8 @@

 		}else

 			funcs[i](i);

 	r = cpuid(0x80000000, 0);

+	if(r.ax < 0x80000000)

+		exits(nil);

 	r.ax -= 0x80000000;

 	for(i = 0; i <= r.ax; i++)

 		if(i >= nelem(extfuncs) || extfuncs[i] == nil || rflag){

@@ -253,5 +255,5 @@

 				stdfunc(0x80000000 | i);

 		}else

 			extfuncs[i](0x80000000 | i);

-	Bterm(out);

+	exits(nil);

 }

-- 

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