virtio/net: remove unnecessary closure

Let's make clippy happy again.

Signed-off-by: Sergio Lopez <slp@redhat.com>

Author: slp

src/devices/src/virtio/net/worker.rs

@@ -400,7 +400,7 @@ impl NetWorker {
         let queue = &mut self.queues[RX_INDEX];
         let head_descriptor = queue
             .pop(&self.mem)
-            .ok_or_else(|| FrontendError::EmptyQueue)?;
+            .ok_or(FrontendError::EmptyQueue)?;
         let head_index = head_descriptor.index;
 
         let mut frame_slice = &self.rx_frame_buf[..self.rx_frame_buf_len];