refactor(upgradepkg): turn nofiles into a boolean variable

Author: akinomyoga

completions/upgradepkg

@@ -14,12 +14,12 @@ _upgradepkg()
     if [[ $cur == ?*%* ]]; then
         prev="${cur%%?(\\)%*}"
         cur="${cur#*%}"
-        local nofiles="" IFS=$'\n'
+        local nofiles=false IFS=$'\n'
         compopt -o filenames
         COMPREPLY=($(compgen -P "$prev%" -f -X "!*.@(t[bgxl]z)" -- "$cur"))
-        [[ ${COMPREPLY-} ]] || nofiles=1
+        [[ ${COMPREPLY-} ]] || nofiles=true
         COMPREPLY+=($(compgen -P "$prev%" -S '/' -d -- "$cur"))
-        [[ $nofiles ]] && compopt -o nospace
+        "$nofiles" && compopt -o nospace
         return
     fi