[IA64] Fix trap #45 handling

In this case, the original author did not provide the related reason
string for die_if_kernel(), so the 'buf' is not initialized.

The original author wants to generic a 'SIGSEGV' and 'return', not want
to 'break' to fall to die.

[Probably irrelevent since we no longer support IA-32 execution. -Tony]
Signed-off-by: Chen Gang <gang.chen@asianux.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>

arch/ia64/kernel/traps.c

@@ -630,7 +630,7 @@ ia64_fault (unsigned long vector, unsigned long isr, unsigned long ifa,
 		printk(KERN_ERR "  iip - 0x%lx, ifa - 0x%lx, isr - 0x%lx\n",
 		       iip, ifa, isr);
 		force_sig(SIGSEGV, current);
-		break;
+		return;
 
 	      case 46:
 		printk(KERN_ERR "Unexpected IA-32 intercept trap (Trap 46)\n");