From: Nikolaus Schuetz <nikolauspschuetz@gmail.com>

git-symbolic-ref(1) documents that reading a name that is not a
symbolic ref exits with a non-zero status, and that --quiet does so
silently rather than printing a diagnostic.  This was not tested.

Check that querying a non-symbolic ref exits 128 with the usual
"is not a symbolic ref" message, and that --quiet instead exits 1
with no output.

Signed-off-by: Nikolaus Schuetz <nikolauspschuetz@gmail.com>

Submitted-As: https://lore.kernel.org/git/pull.2204.git.1786655554197.gitgitgadget@gmail.com