af_packet: fix some leaks

Fix possible memory leak issue: free kvlist before return;
Fix possible resource lost issue: close qssockfd before return;

Signed-off-by: Changchun Ouyang <changchun.ouyang@intel.com>
Acked-by: Michael Qiu <michael.qiu@intel.com>
Acked-by: Neil Horman <nhorman@tuxdriver.com>
Acked-by: John W. Linville <linville@tuxdriver.com>