doxygen: fix a variable name.
doxygen: fix a variable name.

Variable name in doxygen description was not correct.

Signed-off-by: Eric Leblond <96f164ad4d9b2b0dacf8ebee2bb1eeb3aa69adf1@regit.org>

chamaken/libmnl,fqrouter/libmnl,chamaken/libmnl,threatstack/libmnl,fqrouter/libmnl,greearb/libmnl-ct,threatstack/libmnl,greearb/libmnl-ct