t9300: factor out portable "head -c" replacement

diff --git a/credential.c b/credential.c
index 7d6501d190a529933d501e7f7006a70c4897282b..aa996669fc40021e0c8cb01fa8021da7064e2781 100644 (file)
--- a/credential.c
+++ b/credential.c
@@ -63,9 +63,12 @@ static int credential_config_callback(const char *var, const char *value,
                key = dot + 1;
        }
 
-       if (!strcmp(key, "helper"))
-               string_list_append(&c->helpers, value);
-       else if (!strcmp(key, "username")) {
+       if (!strcmp(key, "helper")) {
+               if (*value)
+                       string_list_append(&c->helpers, value);
+               else
+                       string_list_clear(&c->helpers, 0);
+       } else if (!strcmp(key, "username")) {
                if (!c->username)
                        c->username = xstrdup(value);
        }