Remove missed callback_guard

Author: EPashkin

src/pixbuf.rs

@@ -104,7 +104,6 @@ impl Pixbuf {
         let user_data: Box<Box<R>> = Box::new(Box::new(callback));
         unsafe extern "C" fn new_from_stream_async_trampoline<R: FnOnce(Result<Pixbuf, Error>) + Send + 'static>(_source_object: *mut gobject_ffi::GObject, res: *mut gio_ffi::GAsyncResult, user_data: glib_ffi::gpointer)
         {
-            callback_guard!();
             let mut error = ptr::null_mut();
             let ptr = ffi::gdk_pixbuf_new_from_stream_finish(res, &mut error);
             let result = if error.is_null() {
@@ -127,7 +126,6 @@ impl Pixbuf {
         let user_data: Box<Box<R>> = Box::new(Box::new(callback));
         unsafe extern "C" fn new_from_stream_at_scale_async_trampoline<R: FnOnce(Result<Pixbuf, Error>) + Send + 'static>(_source_object: *mut gobject_ffi::GObject, res: *mut gio_ffi::GAsyncResult, user_data: glib_ffi::gpointer)
         {
-            callback_guard!();
             let mut error = ptr::null_mut();
             let ptr = ffi::gdk_pixbuf_new_from_stream_finish(res, &mut error);
             let result = if error.is_null() {
@@ -187,7 +185,6 @@ impl Pixbuf {
         let user_data: Box<Box<Q>> = Box::new(Box::new(callback));
         unsafe extern "C" fn get_file_info_async_trampoline<Q: FnOnce(Result<Option<(PixbufFormat, i32, i32)>, Error>) + Send + 'static>(_source_object: *mut gobject_ffi::GObject, res: *mut gio_ffi::GAsyncResult, user_data: glib_ffi::gpointer)
         {
-            callback_guard!();
             let mut error = ptr::null_mut();
             let mut width = mem::uninitialized();
             let mut height = mem::uninitialized();

src/rt.rs

@@ -6,12 +6,3 @@
 macro_rules! assert_initialized_main_thread {
     () => ()
 }
-
-macro_rules! callback_guard {
-    () => (
-        let _guard = ::glib::CallbackGuard::new();
-        if cfg!(debug_assertions) {
-            assert_initialized_main_thread!();
-        }
-    )
-}