builtin/merge.c: fix a bug with trivial merges

diff --git a/log-tree.c b/log-tree.c
index 35e780170a2529cf528f4edfcd6bac9dcab5591f..60f983934d5ea2c8e276d2c493d78caf56e9a39a 100644 (file)
--- a/log-tree.c
+++ b/log-tree.c
@@ -77,9 +77,8 @@ int parse_decorate_color_config(const char *var, const char *slot_name, const ch
 
 void add_name_decoration(enum decoration_type type, const char *name, struct object *obj)
 {
-       int nlen = strlen(name);
-       struct name_decoration *res = xmalloc(sizeof(*res) + nlen + 1);
-       memcpy(res->name, name, nlen + 1);
+       struct name_decoration *res;
+       FLEX_ALLOC_STR(res, name, name);
        res->type = type;
        res->next = add_decoration(&name_decoration, obj, res);
 }
@@ -342,7 +341,8 @@ void log_write_email_headers(struct rev_info *opt, struct commit *commit,
 {
        const char *subject = NULL;
        const char *extra_headers = opt->extra_headers;
-       const char *name = oid_to_hex(&commit->object.oid);
+       const char *name = oid_to_hex(opt->zero_commit ?
+                                     &null_oid : &commit->object.oid);
 
        *need_8bit_cte_p = 0; /* unknown */
        if (opt->total > 0) {