libalpm: free trans before databases

When releasing the handle, alpm tries to do some self clean up by
freeing the databases and transaction.

However, databases refuse to unregister is there is an in progress
transaction. Causing them to leak if the handle is released while
a transaction is active.

lib/libalpm/alpm.c

@@ -100,6 +100,11 @@ int SYMEXPORT alpm_release(alpm_handle_t *myhandle)
 
 	CHECK_HANDLE(myhandle, return -1);
 
+	/* free transaction memory */
+	if(myhandle->trans && alpm_trans_release(myhandle) == -1) {
+		return -1;
+	}
+
 	/* close local database */
 	db = myhandle->db_local;
 	if(db) {