mod_freetdm: Really avoid overwriting the last element of spanparameters.

"if (ftdm_array_len(spanparameters) == paramindex)" is still off-by-one,
we want to stop at "ftdm_array_len(spanparameters) - 1", before we overwrite
the last (= terminating, NULL) element.

NOTE: i'd prefer an "argc, argv"-style interface here
Signed-off-by: Stefan Knoblich <s.knoblich@axsentis.de>

libs/freetdm/mod_freetdm/mod_freetdm.c

@@ -2434,7 +2434,7 @@ static void parse_bri_pri_spans(switch_xml_t cfg, switch_xml_t spans)
 			char *var = (char *) switch_xml_attr_soft(param, "name");
 			char *val = (char *) switch_xml_attr_soft(param, "value");
 
-			if (ftdm_array_len(spanparameters) == paramindex) {
+			if (ftdm_array_len(spanparameters) - 1 == paramindex) {
 				switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_ERROR, "Too many parameters for ss7 span, ignoring any parameter after %s\n", var);
 				break;
 			}
@@ -2594,7 +2594,7 @@ static switch_status_t load_config(void)
 				char *var = (char *) switch_xml_attr_soft(param, "name");
 				char *val = (char *) switch_xml_attr_soft(param, "value");
 
-				if (ftdm_array_len(spanparameters) == paramindex) {
+				if (ftdm_array_len(spanparameters) - 1 == paramindex) {
 					switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_ERROR, "Too many parameters for ss7 span, ignoring any parameter after %s\n", var);
 					break;
 				}
@@ -3106,7 +3106,7 @@ static switch_status_t load_config(void)
 				char *var = (char *) switch_xml_attr_soft(param, "name");
 				char *val = (char *) switch_xml_attr_soft(param, "value");
 
-				if (ftdm_array_len(spanparameters) == paramindex) {
+				if (ftdm_array_len(spanparameters) - 1 == paramindex) {
 					ftdm_log(FTDM_LOG_ERROR, "Too many parameters for libpri span, ignoring everything after '%s'\n", var);
 					break;
 				}
@@ -3171,7 +3171,7 @@ static switch_status_t load_config(void)
 				char *var = (char *) switch_xml_attr_soft(param, "name");
 				char *val = (char *) switch_xml_attr_soft(param, "value");
 
-				if (ftdm_array_len(spanparameters) == paramindex) {
+				if (ftdm_array_len(spanparameters) - 1 == paramindex) {
 					switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_ERROR, "Too many parameters for boost span, ignoring any parameter after %s\n", var);
 					break;
 				}