qemu: fix command line dupliction when retrying

When retrying, the command line was not created but duplicated.

Signed-off-by: Rémi Duraffort <remi.duraffort@linaro.org>
15 jobs for fix-qemu-retry in 15 minutes and 56 seconds (queued for 2 seconds)
Status Job ID Name Coverage
  Test
passed #91718
amd64
dispatcher-debian-10

00:02:21

passed #91720
amd64
dispatcher-debian-11

00:02:36

passed #91719
amd64
server-debian-10

00:02:53

passed #91721
amd64
server-debian-11

00:05:13

 
  Analyze
passed #91723
amd64
black

00:00:33

passed #91724
amd64
code_quality

00:00:22

passed #91725
amd64
coverage

00:06:14

58.92%
passed #91726
amd64
dockerfiles

00:00:18

passed #91728
amd64
pylint

00:02:52

passed #91722
amd64-dind
sast

00:02:18

passed #91727
amd64
schemas

00:00:30

 
  Build
passed #91730
amd64
debian/10

00:01:19

passed #91729
amd64
doc

00:00:40

passed #91731
amd64-dind
docker-amd64-dispatcher

00:03:50

passed #91732
amd64-dind
docker-amd64-server

00:04:25