x86, uaccess: Merge prototypes for clear_user/__clear_user

The prototypes for clear_user() and __clear_user() are identical in
the 32- and 64-bit headers. No functionality change.

Signed-off-by: H. Peter Anvin <[e-mail]>
Link: http://lkml.kernel.org/r/[e-mail]

arch/x86/include/asm/uaccess.h

···
 extern __must_check long strlen_user(const char __user *str);
 extern __must_check long strnlen_user(const char __user *str, long n);
 
+unsigned long __must_check clear_user(void __user *mem, unsigned long len);
+unsigned long __must_check __clear_user(void __user *mem, unsigned long len);
+
 /*
  * movsl can be slow when source and dest are not both 8-byte aligned
  */

arch/x86/include/asm/uaccess_32.h

···
 	return n;
 }
 
-unsigned long __must_check clear_user(void __user *mem, unsigned long len);
-unsigned long __must_check __clear_user(void __user *mem, unsigned long len);
-
 #endif /* _ASM_X86_UACCESS_32_H */

arch/x86/include/asm/uaccess_64.h

···
 	}
 }
 
-__must_check unsigned long clear_user(void __user *mem, unsigned long len);
-__must_check unsigned long __clear_user(void __user *mem, unsigned long len);
-
 static __must_check __always_inline int
 __copy_from_user_inatomic(void *dst, const void __user *src, unsigned size)
 {