Convert to use quiet option when available

A minor fix that eliminates usage of "2>/dev/null" when --quiet or
-q has already been implemented.

Signed-off-by: Dan Loewenherz <daniel.loewenherz@yale.edu>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
diff --git a/git-pull.sh b/git-pull.sh
index 8c75027..3526153 100755
--- a/git-pull.sh
+++ b/git-pull.sh
@@ -147,7 +147,7 @@
 	echo >&2 "Warning: fetch updated the current branch head."
 	echo >&2 "Warning: fast forwarding your working tree from"
 	echo >&2 "Warning: commit $orig_head."
-	git update-index --refresh 2>/dev/null
+	git update-index -q --refresh
 	git read-tree -u -m "$orig_head" "$curr_head" ||
 		die 'Cannot fast-forward your working tree.
 After making sure that you saved anything precious from