setup.c: guard config parser from value=NULL

core.worktree expects a string value

Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/setup.c b/setup.c
index adede16a4deea1423f52c3b736de735d27f7172a..4509598d577baba8b1d7e8782d8e6ff8e74f9556 100644 (file)
--- a/setup.c
+++ b/setup.c
@@ -372,6 +372,8 @@ int check_repository_format_version(const char *var, const char *value)
                if (is_bare_repository_cfg == 1)
                        inside_work_tree = -1;
        } else if (strcmp(var, "core.worktree") == 0) {
+               if (!value)
+                       return config_error_nonbool(var);
                if (git_work_tree_cfg)
                        free(git_work_tree_cfg);
                git_work_tree_cfg = xstrdup(value);