Fix _filedir error message on bash-3

In case of `sudo cmd', _filedir might be triggered for a cmd not having a
complete command, hence `complete -p cmd' could yield an error. (Alioth

CHANGES

@@ -17,6 +17,7 @@ bash-completion (2.x)
   [ Freddy Vulto ]
   * Added _tilde(), fix ~username completion (Alioth: #312613, Debian: #587095)
   * Speed up `compopt' availability detection
+  * Fix _filedir `-o filenames' detection on bash-3 (Alioth: #312646)
 
   [ Anton Khirnov ]
   * Improve mplayer and mencoder completions.

bash_completion

@@ -647,7 +647,8 @@ _filedir()
             # Is `-o filenames' set?
             [[ (
                 ${COMP_WORDS[0]} && 
-                "$(complete -p ${COMP_WORDS[0]})" == *"-o filenames"*
+                "$(complete -p ${COMP_WORDS[0]} &>/dev/null)" == \
+                    *"-o filenames"*
             ) ]] || {
                 # No, `-o filenames' isn't set;
                 # Emulate `-o filenames'

test/lib/completions/sudo.exp

@@ -17,4 +17,10 @@ assert_complete "fixtures/shared/default/foo.d/" "sudo cd fixtures/shared/defaul
 sync_after_int
 
 
+assert_complete "fixtures/" "sudo sh fix"
+
+
+sync_after_int
+
+
 teardown