alpha: remove stray debris left in copy_process()

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

arch/alpha/kernel/process.c

@@ -250,7 +250,6 @@ copy_thread(unsigned long clone_flags, unsigned long usp,
 	struct pt_regs *childregs = task_pt_regs(p);
 	struct pt_regs *regs = current_pt_regs();
 	struct switch_stack *childstack, *stack;
-	unsigned long settls;
 
 	childstack = ((struct switch_stack *) childregs) - 1;
 	childti->pcb.ksp = (unsigned long) childstack;