ci: Make a missing device name correctly bail out of deqp-runner.sh.

If your driver is totally broken and can't even report its name, let's
stop here instead of doing a CTS run full of failure to start tests and
reporting them all missing at the end.

Reviewed-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/6324>
diff --git a/.gitlab-ci/deqp-runner.sh b/.gitlab-ci/deqp-runner.sh
index c81229d..8d9995e 100755
--- a/.gitlab-ci/deqp-runner.sh
+++ b/.gitlab-ci/deqp-runner.sh
@@ -238,7 +238,7 @@
     $DEQP $DEQP_OPTIONS --deqp-case=dEQP-VK.info.device --deqp-log-filename=$RESULTS/deqp-info.qpa
     DEVICENAME=`grep deviceName $RESULTS/deqp-info.qpa | sed 's|deviceName: ||g'`
     echo "deviceName: $DEVICENAME"
-    if [ -n "$DEQP_EXPECTED_RENDERER" -a $DEVICENAME != "$DEQP_EXPECTED_RENDERER" ]; then
+    if [ -n "$DEQP_EXPECTED_RENDERER" -a "x$DEVICENAME" != "x$DEQP_EXPECTED_RENDERER" ]; then
         echo "Expected deviceName $DEQP_EXPECTED_RENDERER"
         exit 1
     fi