s390/uaccess: remove dead extern declarations, make functions static

Remove some dead uaccess extern declarations and also make some functions
static, since they are only used locally.

Signed-off-by: Heiko Carstens <[e-mail]>
Signed-off-by: Martin Schwidefsky <[e-mail]>

arch/s390/lib/uaccess.h

···
 #ifndef __ARCH_S390_LIB_UACCESS_H
 #define __ARCH_S390_LIB_UACCESS_H
 
-extern size_t copy_from_user_std(size_t, const void __user *, void *);
-extern size_t copy_to_user_std(size_t, void __user *, const void *);
-extern size_t strnlen_user_std(size_t, const char __user *);
-extern size_t strncpy_from_user_std(size_t, const char __user *, char *);
-extern int futex_atomic_cmpxchg_std(u32 *, u32 __user *, u32, u32);
-extern int futex_atomic_op_std(int, u32 __user *, int, int *);
-
-extern size_t copy_from_user_pt(size_t, const void __user *, void *);
-extern size_t copy_to_user_pt(size_t, void __user *, const void *);
 extern int futex_atomic_op_pt(int, u32 __user *, int, int *);
 extern int futex_atomic_cmpxchg_pt(u32 *, u32 __user *, u32, u32);
 

arch/s390/lib/uaccess_pt.c

···
 	return 0;
 }
 
-size_t copy_from_user_pt(size_t n, const void __user *from, void *to)
+static size_t copy_from_user_pt(size_t n, const void __user *from, void *to)
 {
 	size_t rc;
 
···
 	return rc;
 }
 
-size_t copy_to_user_pt(size_t n, void __user *to, const void *from)
+static size_t copy_to_user_pt(size_t n, void __user *to, const void *from)
 {
 	if (segment_eq(get_fs(), KERNEL_DS))
 		return copy_in_kernel(n, to, (void __user *) from);