main.c: resolve possible null pointer dereference

found by cppcheck

[main.c:457] -> [main.c:457]: (warning) Either the condition 'copy_data->dwData==(WM_APP+15)&&c->hwndStatus&&c' is redundant or there is possible null pointer dereference: c.

main.c

@@ -454,7 +454,7 @@ HandleCopyDataMessage(const COPYDATASTRUCT *copy_data)
             ForceForegroundWindow(o.hWnd);
         RestartOpenVPN(c);
     }
-    else if(copy_data->dwData == WM_OVPN_SHOWSTATUS && c->hwndStatus && c)
+    else if(copy_data->dwData == WM_OVPN_SHOWSTATUS && c && c->hwndStatus)
     {
         ForceForegroundWindow(o.hWnd);
         ShowWindow(c->hwndStatus, SW_SHOW);