powerpc: unexport csum_tcpudp_magic

csum_tcpudp_magic is now an inline function, so there is
nothing to export
Signed-off-by: NChristophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: NScott Wood <oss@buserror.net>

arch/powerpc/lib/ppc_ksyms.c

@@ -20,7 +20,6 @@ EXPORT_SYMBOL(strncmp);
 EXPORT_SYMBOL(csum_partial);
 EXPORT_SYMBOL(csum_partial_copy_generic);
 EXPORT_SYMBOL(ip_fast_csum);
-EXPORT_SYMBOL(csum_tcpudp_magic);
 #endif
 
 EXPORT_SYMBOL(__copy_tofrom_user);