staging: wlan-ng: renames ANL_currFC to avoid camelcase

Renames the camelcased variable ANL_currFC to anl_curr_fc in order
to fix a checkpatch warning.

Signed-off-by: Juliana Rodrigues <juliana.orod@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>