Refactor BaseConnectionPool empty method

Signed-off-by: Bandini Bhopi <[email protected]>

Author: bandinib-amzn

lib/pool/BaseConnectionPool.js

@@ -150,13 +150,14 @@ class BaseConnectionPool {
     let openConnections = this.size;
     this.connections.forEach((connection) => {
       connection.close(() => {
-        if (--openConnections === 0) {
-          this.connections = [];
-          this.size = this.connections.length;
-          callback();
-        }
+        openConnections--;
       });
     });
+    if (openConnections === 0) {
+      this.connections = [];
+      this.size = this.connections.length;
+      callback();
+    }
   }
 
   /**