contrib/bash_completion: don't print stderr messages

If you are a crazy developer like me and have bogus options in your
pacman.conf file, the tab completion gets messed up by the output on
stderr. Suppress it.

Fix the same basic issue in zsh_completion, thanks to the work by
Florian Pritz <bluewind@xinu.at>.

Signed-off-by: Dan McGee <dan@archlinux.org>

contrib/bash_completion.in

@@ -59,9 +59,9 @@ _makepkg() {
 _pacman_pkg() {
   _arch_compgen "$(
     if [[ $2 ]]; then
-      \pacman -$1 | \cut -d' ' -f1 | \sort -u
+      \pacman -$1 2>/dev/null | \cut -d' ' -f1 | \sort -u
     else
-      \pacman -$1
+      \pacman -$1 2>/dev/null
     fi
   )"
 }

contrib/zsh_completion.in

@@ -276,7 +276,7 @@ _pacman_completions_repositories() {
 # $cmd must be declared by calling function
 _pacman_get_command() {
 	# this is mostly nicked from _perforce
-	cmd=( "pacman" )
+	cmd=( "pacman" "2>/dev/null")
 	integer i
 	for (( i = 2; i < CURRENT - 1; i++ )); do
 		if [[ ${words[i]} = "--config" || ${words[i]} = "--root" ]]; then