sunrpc: copy scope ID in __rpc_copy_addr6

When copying an address, we should also copy the scopeid in the event
that this is a link-local address and the scope matters.

Signed-off-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
diff --git a/include/linux/sunrpc/clnt.h b/include/linux/sunrpc/clnt.h
index 47354a2..6a7c261 100644
--- a/include/linux/sunrpc/clnt.h
+++ b/include/linux/sunrpc/clnt.h
@@ -242,6 +242,7 @@
 
 	dsin6->sin6_family = ssin6->sin6_family;
 	dsin6->sin6_addr = ssin6->sin6_addr;
+	dsin6->sin6_scope_id = ssin6->sin6_scope_id;
 	return true;
 }
 #else	/* !(IS_ENABLED(CONFIG_IPV6) */