net: unexport csum_and_copy_{from,to}_user

csum_and_copy_from_user and csum_and_copy_to_user are exported by a few
architectures, but not actually used in modular code. Drop the exports.

Link: https://lkml.kernel.org/r/[e-mail]
Signed-off-by: Christoph Hellwig <[e-mail]>
Acked-by: Jakub Kicinski <[e-mail]>
Acked-by: Geert Uytterhoeven <[e-mail]>
Acked-by: Arnd Bergmann <[e-mail]>
Acked-by: Michael Ellerman <[e-mail]> (powerpc)
Cc: David Miller <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>

arch/alpha/lib/csum_partial_copy.c

···
 		return 0;
 	return __csum_and_copy(src, dst, len);
 }
-EXPORT_SYMBOL(csum_and_copy_from_user);
 
 __wsum
 csum_partial_copy_nocheck(const void *src, void *dst, int len)

arch/m68k/lib/checksum.c

···
 	return sum;
 }
 
-EXPORT_SYMBOL(csum_and_copy_from_user);
-
 
 /*
  * copy from kernel space while checksumming, otherwise like csum_partial

arch/powerpc/lib/checksum_wrappers.c

···
 	user_read_access_end();
 	return csum;
 }
-EXPORT_SYMBOL(csum_and_copy_from_user);
 
 __wsum csum_and_copy_to_user(const void *src, void __user *dst, int len)
 {
···
 	user_write_access_end();
 	return csum;
 }
-EXPORT_SYMBOL(csum_and_copy_to_user);

arch/x86/lib/csum-wrappers_64.c

···
 	user_access_end();
 	return sum;
 }
-EXPORT_SYMBOL(csum_and_copy_from_user);
 
 /**
  * csum_and_copy_to_user - Copy and checksum to user space.
···
 	user_access_end();
 	return sum;
 }
-EXPORT_SYMBOL(csum_and_copy_to_user);
 
 /**
  * csum_partial_copy_nocheck - Copy and checksum.