Add missing initialized check to Mouse.java

src/java/org/lwjgl/input/Mouse.java

@@ -271,6 +271,7 @@ public class Mouse {
 	public static void create() throws LWJGLException {
 		if (!Display.isCreated()) throw new IllegalStateException("Display must be created prior to creating mouse");
 
+		if (!initialized)
 			initialize();
 		if (created) { return; }
 		nCreate();