refactor(completions/*): update uses of { => _comp_}quote

Author: akinomyoga

completions/_umount.linux

@@ -15,8 +15,10 @@ _reply_compgen_array()
     # argument.
     local i wlist
     for i in ${!COMPREPLY[*]}; do
-        local q=$(quote "$(printf %q "${COMPREPLY[i]}")")
-        wlist+=$q$'\n'
+        local ret
+        printf -v ret %q "${COMPREPLY[i]}"
+        _comp_quote "$ret"
+        wlist+=$ret$'\n'
     done
 
     # We also have to add another round of escaping to $cur.

completions/export

@@ -31,7 +31,9 @@ _export()
     case $cur in
         *=)
             local pname=${cur%=}
-            local pval=$(quote "${!pname-}")
+            local ret
+            _comp_quote "${!pname-}"
+            local pval=$ret
             # Complete previous value if it's not empty.
             if [[ $pval != \'\' ]]; then
                 COMPREPLY=("$pval")