linux-info.eclass: get_localversion, do not call 'ls'

Use bash array to perform a safe filename glob instead of calling 'ls'.
Also, use nullglob to cleanly handle no matches instead of silencing
errors.

eclass/linux-info.eclass

@@ -390,8 +390,13 @@ kernel_is() {
 get_localversion() {
  local lv_list i x
 
+ local shopt_save=$(shopt -p nullglob)
+ shopt -s nullglob
+ local files=( ${1}/localversion* )
+ ${shopt_save}
+
  # ignore files with ~ in it.
- for i in $(ls ${1}/localversion* 2>/dev/null); do
+ for i in "${files[@]}"; do
  [[ -n ${i//*~*} ]] && lv_list="${lv_list} ${i}"
  done