alpha: make thread_saved_pc static

The only user of thread_saved_pc() in non-arch-specific code was removed
in commit 8243d5597793 ("sched/core: Remove pointless printout in
sched_show_task()"), so it no longer needs to be globally defined for
Alpha and can be made static.

Signed-off-by: Tobias Klauser <[e-mail]>
Signed-off-by: Matt Turner <[e-mail]>

arch/alpha/include/asm/processor.h

···
 struct thread_struct { };
 #define INIT_THREAD  { }
 
-/* Return saved PC of a blocked thread.  */
-struct task_struct;
-extern unsigned long thread_saved_pc(struct task_struct *);
-
 /* Do necessary setup to start up a newly executed thread.  */
 struct pt_regs;
 extern void start_thread(struct pt_regs *, unsigned long, unsigned long);
 
 /* Free all resources held by a thread. */
+struct task_struct;
 extern void release_thread(struct task_struct *);
 
 unsigned long get_wchan(struct task_struct *p);

arch/alpha/kernel/process.c

···
  * all.  -- r~
  */
 
-unsigned long
+static unsigned long
 thread_saved_pc(struct task_struct *t)
 {
 	unsigned long base = (unsigned long)task_stack_page(t);