Fixed cppcheck (error) Memory leak: appname

src/ACGL/HardwareSupport/SpaceNavPollInterface.cc

@@ -260,6 +260,7 @@ bool SpaceNavConnectToDriverMac()
 
     OSErr result = InstallConnexionHandlers( SpaceNavCallbackMac, 0L, 0L);
     if (result != noErr) {
+        delete[] appname;
         return false;
     }
     g_SpaceNavClientID = RegisterConnexionClient( kConnexionClientWildcard, appname, kConnexionClientModeTakeOver, kConnexionMaskAll);