compiler: make [live] fn unlock its mutex on early return

examples/hot_reload/bounce.v

@@ -56,6 +56,9 @@ fn main() {
 	println('Starting the game loop...')
 	go game.run()
 	for {
+		if window.should_close() {
+			break
+		}
 		gl.clear()
 		gl.clear_color(255, 255, 255, 255)
 		game.draw()
@@ -101,5 +104,3 @@ fn (game mut Game) run() {
 		time.sleep_ms(17)
 	}
 }
-
-

examples/hot_reload/graph.v

@@ -30,7 +30,10 @@ fn main() {
 		})
 	} 
 	go update() // update the scene in the background in case the window isn't focused 
-	for { 
+	for {
+		if ctx.gg.window.should_close() {
+			break
+		}
 		gg.clear(gx.White) 
 		ctx.draw()
 		ctx.gg.render()