alpha: make thread_saved_pc static

The only user of thread_saved_pc() in non-arch-specific code was removed
in commit 8243d55977 ("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 <tklauser@distanz.ch>
Signed-off-by: Matt Turner <mattst88@gmail.com>

arch/alpha/kernel/process.c

@@ -361,7 +361,7 @@ EXPORT_SYMBOL(dump_elf_task_fp);
  * all.  -- r~
  */
 
-unsigned long
+static unsigned long
 thread_saved_pc(struct task_struct *t)
 {
 	unsigned long base = (unsigned long)task_stack_page(t);