Fix broken _allowed_groups usage (shadow and coreutils)

CHANGES

@@ -13,6 +13,7 @@ bash-completion (2.x)
   [ David Paleino ]
   * If _filedir 'ext' returns nothing, just fallback to generic
     file completion. Patch by Clint Byrum (Debian: #619014, LP: #533985)
+  * Fix broken _allowed_groups usage (shadow and coreutils)
 
   [ Freddy Vulto ]
   * Improve __reassemble_comp_words_by_ref() to not create words of

completions/coreutils

@@ -84,7 +84,7 @@ _chgrp()
 
     # first parameter on line or first since an option?
     if [[ $COMP_CWORD -eq 1 && "$cur" != -* || "$prev" == -* ]]; then
-        _allowed_groups
+        _allowed_groups "$cur"
     else
         _filedir || return 0
     fi

completions/shadow

@@ -317,10 +317,12 @@ have newgrp &&
 _newgrp()
 {
     COMPREPLY=()
-    if [[ "`_get_cword`" == "-" ]]; then
+    _get_comp_words_by_ref cur
+
+    if [[ "$cur" == "-" ]]; then
         COMPREPLY=( - )
     else
-        _allowed_groups
+        _allowed_groups "$cur"
     fi
 } &&
 complete -F _newgrp newgrp