libalpm/sync.c : don't go back on STATE_PREPARED when committing fails.

In my opinion, a commiting transaction that failed isn't equivalent
to a prepared transaction.
Some things could have been done in the meantime.

Signed-off-by: Chantry Xavier <shiningxc@gmail.com>

lib/libalpm/sync.c

@@ -1022,8 +1022,6 @@ int _alpm_sync_commit(pmtrans_t *trans, pmdb_t *db_local, alpm_list_t **data)
 error:
 	_alpm_trans_free(tr);
 	tr = NULL;
-	/* commiting failed, so this is still just a prepared transaction */
-	trans->state = STATE_PREPARED;
 	return(-1);
 }