Fix UB: Non-static callbacks are unsound

src/ws/client.rs

@@ -533,7 +533,7 @@ impl EspWebSocketClient {
     }
 }
 
-impl<'a> Drop for EspWebSocketClient<'a> {
+impl Drop for EspWebSocketClient {
     fn drop(&mut self) {
         esp!(unsafe { esp_websocket_client_close(self.handle, self.timeout) }).unwrap();
         esp!(unsafe { esp_websocket_client_destroy(self.handle) }).unwrap();
@@ -542,22 +542,22 @@ impl<'a> Drop for EspWebSocketClient<'a> {
     }
 }
 
-impl<'a> RawHandle for EspWebSocketClient<'a> {
+impl RawHandle for EspWebSocketClient {
     type Handle = esp_websocket_client_handle_t;
 
     fn handle(&self) -> Self::Handle {
         self.handle
     }
 }
 
-impl<'a> ErrorType for EspWebSocketClient<'a> {
+impl ErrorType for EspWebSocketClient {
     type Error = EspIOError;
 }
 
-impl<'a> Sender for EspWebSocketClient<'a> {
+impl Sender for EspWebSocketClient {
     fn send(&mut self, frame_type: FrameType, frame_data: &[u8]) -> Result<(), Self::Error> {
         EspWebSocketClient::send(self, frame_type, frame_data).map_err(EspIOError)
     }
 }
 
-unsafe impl<'a> Send for EspWebSocketClient<'a> {}
+unsafe impl Send for EspWebSocketClient {}