kfdtest: Print a message when there is no GPU

This helps the user to troubleshoot the problem.

Change-Id: If6cf42c488097011285252a6c722d3d74c0f7ce7
Signed-off-by: Yong Zhao <Yong.Zhao@amd.com>

tests/kfdtest/scripts/run_kfdtest.sh

@@ -163,6 +163,11 @@ runKfdTest() {
 
     if [ "$NODE" == "" ]; then
         hsaNodes=$(getHsaNodes)
+
+        if [ "$hsaNodes" == "" ]; then
+            echo "No GPU found in the system."
+            exit 1
+        fi
     else
         hsaNodes=$NODE
     fi