Fix #1984 - allow load_balancer_port as a variable

lib/ansible/modules/cloud/amazon/ec2_elb_lb.py

@@ -521,8 +521,8 @@ class ElbManager(object):
             existing_listener_found = None
             for existing_listener in self.elb.listeners:
                 # Since ELB allows only one listener on each incoming port, a
-                # single match on the incomping port is all we're looking for
-                if existing_listener[0] == listener['load_balancer_port']:
+                # single match on the incoming port is all we're looking for
+                if existing_listener[0] == int(listener['load_balancer_port']):
                     existing_listener_found = self._api_listener_as_tuple(existing_listener)
                     break