The git config callback for git-fetch should only forward calls to
git_default_config when an unknown key is given.  Prevent this in the
case of 'fetch.output' by returning '0', as the other known keys do.

Signed-off-by: Matt Hunter <redacted>
---
 builtin/fetch.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/builtin/fetch.c b/builtin/fetch.c
index 9a45e1e7a44d..1036e8edbc59 100644
--- a/builtin/fetch.c
+++ b/builtin/fetch.c

@@ -171,6 +171,7 @@ static int git_fetch_config(const char *k, const char *v,
 		else
 			die(_("invalid value for '%s': '%s'"),
 			    "fetch.output", v);
+		return 0;
 	}
 
 	return git_default_config(k, v, ctx, cb);

-- 
2.54.0