netfilter: nft_redir: fix module autoload with ip4

AF_INET4 does not exist.

Fixes: c78efc99 ("netfilter: nf_tables: nat: merge nft_redir protocol specific modules)"
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

net/netfilter/nft_redir.c

@@ -233,5 +233,5 @@ module_exit(nft_redir_module_exit);
 
 MODULE_LICENSE("GPL");
 MODULE_AUTHOR("Arturo Borrero Gonzalez <arturo@debian.org>");
-MODULE_ALIAS_NFT_AF_EXPR(AF_INET4, "redir");
+MODULE_ALIAS_NFT_AF_EXPR(AF_INET, "redir");
 MODULE_ALIAS_NFT_AF_EXPR(AF_INET6, "redir");