pkg/util/verify-util-pkg.sh: fix shell return value comparison.

In shell scripts inside [[ .. ]] blocks, ">" is a string comparison
operator. The return value check using it appears to work mostly by
accident, because the only values are "0" and "1". Change to -gt
operator.

pkg/util/verify-util-pkg.sh

@@ -41,7 +41,7 @@ pushd "${BASH_DIR}" > /dev/null
   done
 popd > /dev/null
 
-if [[ ${ret} > 0 ]]; then
+if [[ ${ret} -gt 0 ]]; then
   exit ${ret}
 fi