-l parameter in JackPortAudioDriver display the device then stops the server.

git-svn-id: http://subversion.jackaudio.org/jack/jack2/trunk/jackmp@4668 0c269be4-1314-0410-8aa9-9f06e86f4224

macosx/coreaudio/JackCoreAudioDriver.cpp

@@ -2402,6 +2402,7 @@ extern "C"
 
                 case 'l':
                     Jack::DisplayDeviceNames();
+                    // Stops the server in this case
                     return NULL;
 
                 case 'H':

windows/portaudio/JackPortAudioDriver.cpp

@@ -425,7 +425,8 @@ extern "C"
 
             case 'l':
                 pa_devices->DisplayDevicesNames();
-                break;
+                // Stops the server in this case
+                return NULL;
             }
         }