don't break the accept loop just because we got a client connection that closed early

lib/msf/core/handler/reverse_tcp.rb

@@ -91,11 +91,10 @@ module ReverseTcp
           client = self.listener_sock.accept
           if ! client
             wlog("ReverseTcpHandlerListener-#{local_port}: No client received in call to accept, exiting...")
-            break
-          end
-
+          else
             self.pending_connections += 1
             lqueue.push(client)
+          end
         rescue ::Exception
           wlog("ReverseTcpHandlerListener-#{local_port}: Exception raised during listener accept: #{$!}\n\n#{$@.join("\n")}")
           break