igb: Remove goto

The goto is a bit confusing as it changes the control flow only if L4
protocol is not recognized. It is also different from e1000e, and
noisy when comparing e1000e and igb.

Signed-off-by: Akihiko Odaki <akihiko.odaki@daynix.com>
Reviewed-by: Sriram Yagnaraman <sriram.yagnaraman@est.tech>
Signed-off-by: Jason Wang <jasowang@redhat.com>

hw/net/igb_core.c

@@ -1297,7 +1297,7 @@ igb_build_rx_metadata(IGBCore *core,
             break;
 
         default:
-            goto func_exit;
+            break;
         }
     } else {
         trace_e1000e_rx_metadata_l4_cso_disabled();