ibmvnic: Fix NAPI structures memory leak

This memory is allocated during initialization but never freed,
so do that now.
Signed-off-by: NThomas Falcon <tlfalcon@linux.vnet.ibm.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/ethernet/ibm/ibmvnic.c

@@ -825,6 +825,8 @@ static void release_resources(struct ibmvnic_adapter *adapter)
 			}
 		}
 	}
+	kfree(adapter->napi);
+	adapter->napi = NULL;
 
 	release_login_rsp_buffer(adapter);
 }