sha1_name.c: avoid unnecessary strbuf_release

When we fall back to a standard for_each_reflog_ent() after failing to find
the nth branch switch (or if we had a short reflog) with the call to
for_each_recent_reflog_ent(), we do not need to free the memory allocated
for our strbuf's since a strbuf_reset() will be performed in
grab_nth_branch_switch() before assigning to the entry.

Plus, the strbuf_release() negates the non-zero hint we initially gave to
strbuf_init() just above these lines.

Signed-off-by: Brandon Casey <drafnel@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

sha1_name.c

@@ -777,8 +777,6 @@ int interpret_branch_name(const char *name, struct strbuf *buf)
 	for_each_recent_reflog_ent("HEAD", grab_nth_branch_switch, 40960, &cb);
 	if (cb.cnt < nth) {
 		cb.cnt = 0;
-		for (i = 0; i < nth; i++)
-			strbuf_release(&cb.buf[i]);
 		for_each_reflog_ent("HEAD", grab_nth_branch_switch, &cb);
 	}
 	if (cb.cnt < nth)