[ARM] Make die() more correct.

Use 'tsk' when accessing comm and pid members.
Use regs->ARM_sp not regs + 1 for base of stack dump.

arch/arm/kernel/traps.c

@@ -212,10 +212,10 @@ NORET_TYPE void die(const char *str, struct pt_regs *regs, int err)
 	printk("CPU: %d\n", smp_processor_id());
 	show_regs(regs);
 	printk("Process %s (pid: %d, stack limit = 0x%p)\n",
-		current->comm, current->pid, tsk->thread_info + 1);
+		tsk->comm, tsk->pid, tsk->thread_info + 1);
 
 	if (!user_mode(regs) || in_interrupt()) {
-		dump_mem("Stack: ", (unsigned long)(regs + 1), 8192+(unsigned long)tsk->thread_info);
+		dump_mem("Stack: ", regs->ARM_sp, 8192+(unsigned long)tsk->thread_info);
 		dump_backtrace(regs, tsk);
 		dump_instr(regs);
 	}