[NFC]Fix issue in nfc_jni_stop_discovery_locked()

Fix issue of unitialized varible discovery_cfg.Duration in
nfc_jni_stop_discovery_locked function.

Change-Id: I7c3c4c99cca610de9b463757396bdf3c62b7d91d
Orig-Change-Id: Ica602adee7a19459e36234a32eb3d9c5aa992cf2
Signed-off-by: Dejan REBRACA <dejanx.rebraca@intel.com>
Signed-off-by: Sebastien Griffoul <sebastien.griffoul@intel.com>
Reviewed-on: http://android.intel.com:8080/86753
Reviewed-by: Niciarz, Sebastian <sebastian.niciarz@intel.com>
Signed-off-by: Jian Luo <jian.luo@intel.com>
Signed-off-by: Bruce Beare <bruce.j.beare@intel.com>
Signed-off-by: Jack Ren <jack.ren@intel.com>
Author-tracking-BZ: 80117