vxlan: fix a potential issue when create a new vxlan fdb entry.
vxlan_fdb_append may return error, so add the proper check, otherwise it will cause memory leak. Signed-off-by: NHaishuang Yan <yanhaishuang@cmss.chinamobile.com> Changes in v2: - Unnecessary to initialize rc to zero. Acked-by: NJiri Benc <jbenc@redhat.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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