FS-6500: try to do the bounds checking properly using element of the enum

libs/freetdm/src/ftdm_io.c

@@ -542,11 +542,11 @@ static ftdm_status_t ftdm_set_caller_data(ftdm_span_t *span, ftdm_caller_data_t
 		caller_data->rdnis.type = span->default_caller_data.rdnis.type;
 	}
 
-	if (caller_data->bearer_capability >= FTDM_INVALID_INT_PARM) {
+	if (caller_data->bearer_capability >= FTDM_BEARER_CAP_INVALID) {
 		caller_data->bearer_capability = span->default_caller_data.bearer_capability;
 	}
 
-	if (caller_data->bearer_layer1 >= FTDM_INVALID_INT_PARM) {
+	if (caller_data->bearer_layer1 >= FTDM_USER_LAYER1_PROT_INVALID) {
 		caller_data->bearer_layer1 = span->default_caller_data.bearer_layer1;
 	}