fix: log virtio address

Resolve a TODO for logging the address of a descriptor chain head if
fetching it from guest memory fails.

Closes firecracker-microvm#3592

Co-Authored-By: sladynnunes <snunes@usc.edu>
Signed-off-by: Patrick Roy <roypat@amazon.co.uk>

src/vmm/src/devices/virtio/queue.rs

@@ -94,8 +94,10 @@ impl<'a, M: GuestMemory> DescriptorChain<'a, M> {
         let desc = match mem.read_obj::<Descriptor>(desc_head) {
             Ok(ret) => ret,
             Err(err) => {
-                // TODO log address
-                error!("Failed to read virtio descriptor from memory: {}", err);
+                error!(
+                    "Failed to read virtio descriptor from memory at address {:#x}: {}",
+                    desc_head.0, err
+                );
                 return None;
             }
         };