ipa: Fix resource leak if we encounter an error in ipa_server_conn_read
ipa: Fix resource leak if we encounter an error in ipa_server_conn_read

In case of a connection reset or protocol error we should destroy the
connection as well.

osmobuntu/libosmo-abis,telenoobie/libosmo-abis,osmobuntu/libosmo-abis,osmocom/libosmo-abis,osmobuntu/libosmo-abis,telenoobie/libosmo-abis,osmobuntu/libosmo-abis,osmocom/libosmo-abis,osmocom/libosmo-abis