aio-stress: fix opened fd leak

In cases where worker completes specified number of `iterations` before
oper completes all `total_ios`, such oper remains on active_list.
This is a problem because cleanup only walks over finished list,
and closes fds only for items on this list. So it's possible for
test to exhaust ulimit for open files and fail:

$ ./aio-stress -a1 -I100 -o2 -r4 -f1 -d1^
aio-stress.c:1347: TPASS: Test passed
aio-stress.c:1285: TINFO: starting with random write
aio-stress.c:1296: TINFO: file size 1024MB, record size 0KB, depth 1, I/O per iteration 1
aio-stress.c:1298: TINFO: max io_submit 1, buffer alignment set to 4KB
aio-stress.c:1300: TINFO: threads 1 files 1 contexts 1 context offset 2MB verification off
aio-stress.c:1314: TBROK: open(file0.bin,1052738,0600) failed: EMFILE (24)

Clean/free also items from active_list. Also don't let `status` from cleanup
be set to zero once it becomes non-zero.

Signed-off-by: Jan Stancek <jstancek@redhat.com>
Acked-by: Andrea Cervesato <andrea.cervesato@suse.com>
Reviewed-by: Cyril Hrubis <chrubis@suse.cz>

Author: jstancek

testcases/kernel/io/ltp-aiodio/aio-stress.c

@@ -1122,7 +1122,12 @@ static int *worker(struct thread_info *t)
 	while (t->finished_opers) {
 		oper = t->finished_opers;
 		oper_list_del(oper, &t->finished_opers);
-		status = finish_oper(t, oper);
+		status = finish_oper(t, oper) ? : status;
+	}
+	while (t->active_opers) {
+		oper = t->active_opers;
+		oper_list_del(oper, &t->active_opers);
+		status = finish_oper(t, oper) ? : status;
 	}
 
 	if (t->num_global_pending)