.gitlab-ci: Retrieve return value before any other command

This was previously introduced with commit '.gitlab.ci: Enable debug for
libsteat and for the DRM backend' in order to figure out another CI
issue we were seeing.

Unfortunatelly, not keeping the return value after the tests ran it
would silently make the entire CI succeed when it should actually fail.

Signed-off-by: Marius Vlad <marius.vlad@collabora.com>
Suggested-by: Pekka Paalanen <pekka.paalanen@collabora.com>

.gitlab-ci/virtme-scripts/run-weston-tests.sh

@@ -26,9 +26,11 @@ export SEATD_LOGLEVEL=debug
 # we give ourselves a very generous timeout multiplier due to ASan overhead
 echo 0x1f > /sys/module/drm/parameters/debug
 seatd-launch -- meson test --no-rebuild --timeout-multiplier 4
+# note that we need to store the return value from the tests in order to
+# determine if the test suite ran successfully or not.
+TEST_RES=$?
 dmesg &> dmesg.log
 echo 0x00 > /sys/module/drm/parameters/debug
-TEST_RES=$?
 
 # create a file to keep the result of this script:
 #   - 0 means the script succeeded