lispd: fix cmdline.c warning
lispd: fix cmdline.c warning

If the file is regenerated using gengetopt, the warning will be back,
but at least we provide a warning-less compile for most use cases.

OpenOverlayRouter/oor,Lluiso/oor,OpenOverlayRouter/oor,OpenOverlayRouter/oor,Lluiso/oor,Lluiso/oor,OpenOverlayRouter/oor,OpenOverlayRouter/oor,OpenOverlayRouter/oor,Lluiso/oor,Lluiso/oor,OpenOverlayRouter/oor