VkSwapchain: Remove useless drop_swapchain

src/vulkan/vk_swapchain.rs

@@ -159,18 +159,14 @@ impl VkSwapchain {
             .clipped(true)
             .image_array_layers(1)
     }
+}
 
-    fn drop_swapchain(&mut self) {
+impl Drop for VkSwapchain {
+    fn drop(&mut self) {
         if let Some(swapchain) = self.swapchain {
             unsafe { self.device.swapchain_loader.destroy_swapchain(swapchain, None); }
             self.swapchain = None;
             log::debug!(target: LOG_TARGET, "Swapchain destroyed ({swapchain:?})");
         }
     }
-}
-
-impl Drop for VkSwapchain {
-    fn drop(&mut self) {
-        self.drop_swapchain()
-    }
 }