print slightly better message if git nav-upstream is not called in git repo

Currently, the command will print following message twice when not called
in git repo.

```
fatal: not a git repository (or any parent up to mount point /google)
Stopping at filesystem boundary (GIT_DISCOVERY_ACROSS_FILESYSTEM not set).
```

Bug: 339231299
Change-Id: Iab05e037a81b7e15dcc011d78480cd9ace7c7e36
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/5544438
Commit-Queue: Yiwei Zhang <yiwzhang@google.com>
Reviewed-by: Josip Sokcevic <sokcevic@chromium.org>
changes/38/5544438/4
Yiwei Zhang 1 year ago committed by LUCI CQ
parent 2321f138a8
commit e0038c0721

@ -3,4 +3,9 @@
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.
git checkout "$(git rev-parse --abbrev-ref "@{u}")"
if git rev-parse 2> /dev/null; then
git checkout "$(git rev-parse --abbrev-ref "@{u}")"
else
echo "error: not in a git repository" >&2
exit 1
fi

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