freetdm: removed dump_mf() debug call from ftmod_r2 and added a comment to ftdm_io

libs/freetdm/src/ftdm_io.c

@@ -163,6 +163,8 @@ static ftdm_status_t start_chan_io_dump(ftdm_channel_t *chan, ftdm_io_dump_t *du
 		return FTDM_FAIL;
 	}
 	memset(dump, 0, sizeof(*dump));
+	/* on 64bits, we get a weird number if we don't cast to uint here 
+	 * which is what size_t will be anyway */
 	dump->buffer = ftdm_malloc((uint32_t)size);
 	if (!dump->buffer) {
 		return FTDM_FAIL;

libs/freetdm/src/ftmod/ftmod_r2/ftmod_r2.c

@@ -489,8 +489,6 @@ static void ftdm_r2_on_call_offered(openr2_chan_t *r2chan, const char *ani, cons
 	ftdm_log_chan(ftdmchan, FTDM_LOG_NOTICE, "Call offered with ANI = %s, DNIS = %s, Category = (%d)\n", ani, dnis, category);
 	ftdm_set_state(ftdmchan, FTDM_CHANNEL_STATE_RING);
 
-	dump_mf(r2chan);
-
 	/* nothing went wrong during call setup, MF has ended, we can and must disable the MF dump */
 	if (r2data->mf_dump_size) {
 		ftdm_channel_command(ftdmchan, FTDM_COMMAND_DISABLE_INPUT_DUMP, NULL);