taskprocessor.c: Fix endless loop in CLI "core show taskprocessor"

Revert 48dd99d2b4 which caused an infinite
loop only in v11.

ASTERISK-25701 #close
Reported by: ibercom

Change-Id: I0d9103f4dc03fa31bb8d5e7a7a73b467bbac5349

main/taskprocessor.c

@@ -284,7 +284,7 @@ static char *cli_tps_report(struct ast_cli_entry *e, int cmd, struct ast_cli_arg
 		maxqsize = p->stats->max_qsize;
 		processed = p->stats->_tasks_processed_count;
 		ast_cli(a->fd, "\n%24s   %17lu %12lu %12lu", name, processed, qsize, maxqsize);
-		ast_taskprocessor_unreference(p);
+		ao2_ref(p, -1);
 	}
 	ao2_iterator_destroy(&i);
 	tcount = ao2_container_count(tps_singletons);