couple of valgrind error squash patches

[Stefan Metzmacher]

Hi Noel,

> Please have a look and push if they are ok

I think the tdgram_bsd_recvfrom_handler change is wrong.

tdgram_bsd_recvfrom_recv() only returns a buffer that's
filled by recvfrom() and the talloc_realloc() truncates
the buffer. So the memset writes behind the buffer,
it may not be noticed by valgrind if talloc isn't build
with valgrind support and the caller uses a talloc_pool.

However I think there's a small memory leak in
tdgram_bsd_recvfrom_handler().

        if (retry) {
                /* retry later */
                return;
        }

Before the return we should call
state->len = 0;
TALLOC_FREE(state->buf);

metze

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