Merge branch 'jk/prompt-stash-could-be-packed'

The prompt script checked $GIT_DIR/ref/stash file to see if there
is a stash, which was a no-no.

* jk/prompt-stash-could-be-packed:
  git-prompt: do not look for refs/stash in $GIT_DIR
diff --git a/contrib/completion/git-prompt.sh b/contrib/completion/git-prompt.sh
index 9d684b1..c5473dc 100644
--- a/contrib/completion/git-prompt.sh
+++ b/contrib/completion/git-prompt.sh
@@ -468,7 +468,8 @@
 			fi
 		fi
 		if [ -n "${GIT_PS1_SHOWSTASHSTATE-}" ] &&
-		   [ -r "$g/refs/stash" ]; then
+		   git rev-parse --verify --quiet refs/stash >/dev/null
+		then
 			s="$"
 		fi