Fix error

  - There was a syntax error causing a failure in the CT run

Change-Id: Ia3f34e39d964c3f7fb08bea011a11d0cb22d9946
Signed-off-by: Joy Onyerikwu <onyekachukwu.joy.onyerikwu@ibm.com>
diff --git a/network/test_host_network_interfaces.robot b/network/test_host_network_interfaces.robot
index ac0cb0c..8045de2 100644
--- a/network/test_host_network_interfaces.robot
+++ b/network/test_host_network_interfaces.robot
@@ -28,4 +28,4 @@
     \  ${ethtool_dict}=  Get OS Ethtool  ${interface_name}
     \  Run Keyword If  ${FAIL_ON__LINK_DOWN} == 1
     \  ...  Should Be Equal  ${ethtool_dict['link_detected']}  yes
-    \  ...  msg=Link ${interface} is down.
+    \  ...  msg=Link ${interface_name} is down.