[PATCH] [kernel] completion: silence "fatal: Not a git repository" error

It is possible that a user is trying to run a git command and fail to realize
that they are not in a git repository or working tree.  When trying to complete
an operation, __git_refs would fall to a degenerate case and attempt to use
"git for-each-ref", which would emit the error.

Let's fix this by shunting the error message coming from "git for-each-ref".

Signed-off-by: John Szakmeister <redacted>
---
 contrib/completion/git-completion.bash | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/contrib/completion/git-completion.bash b/contrib/completion/git-completion.bash
index 5ea5b82..31b4739 100644
--- a/contrib/completion/git-completion.bash
+++ b/contrib/completion/git-completion.bash

@@ -388,7 +388,8 @@ __git_refs ()
 		;;
 	*)
 		echo "HEAD"
-		git for-each-ref --format="%(refname:short)" -- "refs/remotes/$dir/" | sed -e "s#^$dir/##"
+		git for-each-ref --format="%(refname:short)" -- \
+			"refs/remotes/$dir/" 2>/dev/null | sed -e "s#^$dir/##"
 		;;
 	esac
 }

-- 
2.0.1