fix(upgradepkg): use _comp_compgen for _comp_cmd_upgradepkg

Author: akinomyoga

completions/upgradepkg

@@ -13,10 +13,9 @@ _comp_cmd_upgradepkg()
     if [[ $cur == ?*%* ]]; then
         prev="${cur%%?(\\)%*}"
         cur="${cur#*%}"
-        local nofiles="" IFS=$'\n'
+        local nofiles=""
         compopt -o filenames
-        COMPREPLY=($(compgen -P "$prev%" -f -X "!*.@(t[bgxl]z)" -- "$cur"))
-        [[ ${COMPREPLY-} ]] || nofiles=set
+        _comp_compgen -- -P "$prev%" -f -X "!*.@(t[bgxl]z)" || nofiles=set
         _comp_compgen -a -- -P "$prev%" -S '/' -d
         [[ $nofiles ]] && compopt -o nospace
         return