ci/bare-metal: suppress 'No such file or directory'

It fills the serial log with unimportant messages.

Signed-off-by: Christian Gmeiner <christian.gmeiner@gmail.com>
Reviewed-by: Eric Anholt <eric@anholt.net>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/7347>

.gitlab-ci/bare-metal/capture-devcoredump.sh

@@ -1,7 +1,7 @@
 #!/bin/sh
 
 while true; do
-  devcds=`find /sys/devices/virtual/devcoredump/ -name data`
+  devcds=`find /sys/devices/virtual/devcoredump/ -name data 2>/dev/null`
   for i in $devcds; do
     echo "Found a devcoredump at $i."
     if cp $i /results/first.devcore; then