Input: sparse-keymap - free the right keymap on error

'map' is allocated in sparse_keymap_setup() and it it the one that should
be freed on error instead of 'keymap'.

Signed-off-by: Yong Wang <yong.y.wang@intel.com>
Cc: stable@kernel.org
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>