kcov: Fix Travis breakage due to missing [[

Author: mbland

scripts/lib/kcov

@@ -47,7 +47,7 @@ run_kcov() {
 
   # Somehow kcov exits with a failure status on Travis, even though the tests
   # all pass and information is successfully posted to Coveralls.
-  if "${kcov_argv[@]}" 2>/dev/null || -n "$TRAVIS_JOB_ID" ]]; then
+  if "${kcov_argv[@]}" 2>/dev/null || [[ -n "$TRAVIS_JOB_ID" ]]; then
     if [[ "$send_to_coveralls" == 'false' ]]; then
       @go.printf 'Coverage results located in:\n  %s\n' \
         "$_GO_ROOTDIR/$coverage_dir"