make _in_sharded_txn static

Author: kevinAlbs

src/libmongoc/src/mongoc/mongoc-cluster.c

@@ -493,7 +493,7 @@ mongoc_cluster_run_command_opquery (mongoc_cluster_t *cluster,
    RETURN (ret);
 }
 
-bool
+static bool
 _in_sharded_txn (const mongoc_client_session_t *session)
 {
    return session && _mongoc_client_session_in_txn_or_ending (session) &&
@@ -904,7 +904,7 @@ _stream_run_hello (mongoc_cluster_t *cluster,
       if (negotiate_sasl_supported_mechs) {
          bsonParse (reply,
                     find (allOf (key ("ok"), isFalse), //
-                          do({
+                          do ({
                              /* hello response returned ok: 0. According to
                               * auth spec: "If the hello of the MongoDB
                               * Handshake fails with an error, drivers MUST