glcpp/tests/glcpp-test: error out if we cannot find any tests

Signed-off-by: Emil Velikov <emil.velikov@collabora.com>
Acked-by: Kenneth Graunke <kenneth@whitecape.org>
Reviewed-by: Eric Engestrom <eric.engestrom@imgtec.com>

src/compiler/glsl/glcpp/tests/glcpp-test.sh

@@ -85,6 +85,11 @@ for test in $testdir/*.c; do
     fi
 done
 
+if [ $total -eq 0 ]; then
+    echo "Could not find any tests."
+    exit 1
+fi
+
 echo ""
 echo "$pass/$total tests returned correct results"
 echo ""