[POWERPC] Fix backwards ? : when printing machine type

Looks like someone got this backwards, highlighting the perils of the
? : !!! :)

Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>
diff --git a/arch/powerpc/kernel/traps.c b/arch/powerpc/kernel/traps.c
index 55d221f..f786222 100644
--- a/arch/powerpc/kernel/traps.c
+++ b/arch/powerpc/kernel/traps.c
@@ -153,7 +153,7 @@
 #ifdef CONFIG_NUMA
 		printk("NUMA ");
 #endif
-		printk("%s\n", ppc_md.name ? "" : ppc_md.name);
+		printk("%s\n", ppc_md.name ? ppc_md.name : "");
 
 		print_modules();
 		show_regs(regs);