lib/syscall.c: unexport task_current_syscall()

It is only used by procfs and procfs cannot be a module.
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

lib/syscall.c

@@ -72,4 +72,3 @@ int task_current_syscall(struct task_struct *target, long *callno,
 
 	return 0;
 }
-EXPORT_SYMBOL_GPL(task_current_syscall);