[PATCH] hostap: Fix double free in prism2_config() error path

The Coverity checker (CID: 930) spotted this double free on error path
(allocation failure). Do not free these here since generic error path
will take care of this.

Signed-off-by: Eugene Teo <eugene.teo@eugeneteo.net>
Signed-off-by: Jouni Malinen <jkmaline@cc.hut.fi>
Signed-off-by: John W. Linville <linville@tuxdriver.com>