[PATCH] missing break in amd 486 cpu case

	An old AMD 486DX4-SE(as reported by bios) here crashes on boot in
amd_init, doing rdmsr in k6 case. Elan fixes added case 4 there but
without break. This break allows it to boot.

arch/i386/kernel/cpu/amd.c

@@ -56,7 +56,7 @@ static void __init init_amd(struct cpuinfo_x86 *c)
 				if (inl (CBAR) & CBAR_ENB)
 					outl (0 | CBAR_KEY, CBAR);
 			}
-
+			break;
 		case 5:
 			if( c->x86_model < 6 )
 			{