Fix memory leak in cgroup_read_stats iterator
Fix memory leak in cgroup_read_stats iterator

getline(&line, ...) can return -1 *and* allocate memory for returned (empty)
line - so be sure to free it.

Signed-off-by: Jan Safranek <a7f4b96ffdd515ecef00f117294da18555749b0b@redhat.com>
Signed-off-by: Dhaval Giani <f48451d72a1ad74c777093928b661ad7099a85df@gmail.com>

rafalmiel/libcg,jrfastab/Linux-cgdcbxd,rafalmiel/libcg,rafalmiel/libcg,rafalmiel/libcg,jrfastab/Linux-cgdcbxd,jrfastab/Linux-cgdcbxd,jrfastab/Linux-cgdcbxd