[PATCH] Double x86 initialise fix.

For many moons, we've been executing identify_cpu()
on the boot processor twice on SMP kernels.
This is harmless, but has a few downsides..
- Extra cruft in bootlog/dmesg
- Spawns one too many timers for the mcheck handler
- possibly other wasteful things..

This seems to do the right thing here, and has been
acked (after some minor squibbles) on l-k.

arch/i386/kernel/smpboot.c

@@ -118,7 +118,8 @@ static void __init smp_store_cpu_info(int id)
 	struct cpuinfo_x86 *c = cpu_data + id;
 
 	*c = boot_cpu_data;
-	identify_cpu(c);
+	if (id!=0)
+		identify_cpu(c);
 	/*
 	 * Mask B, Pentium, but not Pentium MMX
 	 */