Discard error message from which if tput is not found.

BUG=none
TEST=run on cygwin

Review URL: http://codereview.chromium.org/1553001

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@42944 0039d316-1c4b-4281-b951-d872f2087c98
diff --git a/tools/git/git-utils.sh b/tools/git/git-utils.sh
index d89dc5dc..6f347cb 100644
--- a/tools/git/git-utils.sh
+++ b/tools/git/git-utils.sh
@@ -3,7 +3,7 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
-TPUT=$(which tput)
+TPUT=$(which tput 2>/dev/null)
 if test -x "$TPUT" && $TPUT setaf 1 >/dev/null ; then
     RED="$($TPUT setaf 1)"
     NORMAL="$($TPUT op)"