gdkwayland: Cast void pointer to the actual type before calling Box::from_raw()

warning: creating a `Box` from a void raw pointer
  --> gdkwayland/src/wayland_window.rs:53:21
   |
53 |             let _ = Box::from_raw(data as *mut _);
   |                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
help: cast this to a pointer of the appropriate type
  --> gdkwayland/src/wayland_window.rs:53:35
   |
53 |             let _ = Box::from_raw(data as *mut _);
   |                                   ^^^^^^^^^^^^^^
   = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#from_raw_with_void_ptr

Author: sdroege

gdkwayland/src/wayland_window.rs

@@ -44,13 +44,13 @@ impl WaylandWindow {
         ) {
             let window = from_glib_borrow(window);
             let handle: Borrowed<glib::GString> = from_glib_borrow(handle);
-            let callback: &P = &*(user_data as *mut _);
+            let callback = &*(user_data as *mut P);
             (*callback)(&window, handle.as_str());
         }
         unsafe extern "C" fn destroy_notify<P: Fn(&WaylandWindow, &str) + 'static>(
             data: glib::ffi::gpointer,
         ) {
-            let _ = Box::from_raw(data as *mut _);
+            let _ = Box::from_raw(data as *mut P);
         }
         unsafe {
             from_glib(ffi::gdk_wayland_window_export_handle(