Fix test runner to consider Kakoune returning non 0 as a failure

test/run

@@ -54,7 +54,9 @@ main() {
       if [ $should_fail = 0 ]; then
         if [ $retval -ne 0 ]; then
           echo "Kakoune returned error $retval"
-        fi
+          number_failures=$(($number_failures + 1))
+          echo "$indent$name" | colorize red normal
+        else
           for expect in $test_files; do
             if cmp -s $test/$dir/$expect $expect; then
               echo "$indent$name" | colorize green normal
@@ -78,6 +80,7 @@ main() {
               echo
             fi
           done
+        fi
       else
         color=green
         if [ ! -e stderr ]; then