builtin-show-branch.c: guard config parser from value=NULL
showbranch.default configuration expects a string value.
Signed-off-by: Junio C Hamano <gitster@pobox.com>
diff --git a/builtin-show-branch.c b/builtin-show-branch.c
index 6dc835d..019abd3 100644
--- a/builtin-show-branch.c
+++ b/builtin-show-branch.c
@@ -536,6 +536,8 @@
static int git_show_branch_config(const char *var, const char *value)
{
if (!strcmp(var, "showbranch.default")) {
+ if (!value)
+ return config_error_nonbool(var);
if (default_alloc <= default_num + 1) {
default_alloc = default_alloc * 3 / 2 + 20;
default_arg = xrealloc(default_arg, sizeof *default_arg * default_alloc);
