fix syntax

input/backends/sdl3.cm

@@ -22,13 +22,15 @@ function parse_mods(mod) {
 // Translate SDL event to canonical format
 // Returns canonical event or null if not translatable
 function translate(evt) {
+  var control = null
+
   // Keyboard
   if (evt.type == 'key_down' || evt.type == 'key_up') {
     if (evt.repeat) return null  // Ignore key repeats
-    
-    var control = keycode_to_control(evt.key)
+
+    control = keycode_to_control(evt.key)
     if (!control) return null
-    
+
     return {
       kind: 'button',
       device_id: 'kbm',