ipc_shm: fix error handling in qb_ipcs_shm_connect()
ipc_shm: fix error handling in qb_ipcs_shm_connect()

The request and response SHM segments were being closed under the wrong
labels, and the event SHM segment wasn't being cleaned up at all.

ClusterLabs/libqb,rubenk/libqb,rubenk/libqb,ClusterLabs/libqb,gao-yan/libqb,davidvossel/libqb,kgaillot/libqb,gao-yan/libqb,ClusterLabs/libqb,kgaillot/libqb,kgaillot/libqb,davidvossel/libqb