fix hanging

Author: W-A-James

src/mongo_client.ts

@@ -614,19 +614,12 @@ export class MongoClient extends TypedEventEmitter<MongoClientEvents> {
     const topology = this.topology;
     this.topology = undefined;
 
-    await new Promise<void>((resolve, reject) => {
-      topology.close({ force }, error => {
-        if (error) return reject(error);
-        const { encrypter } = this[kOptions];
-        if (encrypter) {
-          return encrypter.closeCallback(this, force, error => {
-            if (error) return reject(error);
-            resolve();
-          });
-        }
-        resolve();
-      });
-    });
+    topology.close();
+
+    const { encrypter } = this[kOptions];
+    if (encrypter) {
+      await encrypter.close(this, force);
+    }
   }
 
   /**

src/sdam/topology.ts

@@ -469,7 +469,7 @@ export class Topology extends TypedEventEmitter<TopologyEvents> {
       (err, server) => {
         if (err) {
           this.close();
-          exitWithError(err);
+          return exitWithError(err);
         }
 
         const skipPingOnConnect = this.s.options[Symbol.for('@@mdb.skipPingOnConnect')] === true;