knotc,knsupdate: fix overriden tsig key memory leak

src/knot/ctl/knotc_main.c

@@ -351,6 +351,7 @@ int main(int argc, char **argv)
 			r_port = atoi(optarg);
 			break;
 		case 'y':
+			knot_tsig_key_deinit(&params->r_key);
 			if (knot_tsig_key_init_str(&r_key, optarg) != KNOT_EOK) {
 				rc = 1;
 				log_error("failed to parse TSIG key '%s'", optarg);
@@ -358,6 +359,7 @@ int main(int argc, char **argv)
 			}
 			break;
 		case 'k':
+			knot_tsig_key_deinit(&params->r_key);
 			if (knot_tsig_key_init_file(&r_key, optarg) != KNOT_EOK) {
 				rc = 1;
 				log_error("failed to parse TSIG key file '%s'", optarg);

src/utils/knsupdate/knsupdate_params.c

@@ -234,10 +234,12 @@ int knsupdate_parse(knsupdate_params_t *params, int argc, char *argv[])
 			if (ret != KNOT_EOK) return ret;
 			break;
 		case 'y':
+			knot_tsig_key_deinit(&params->tsig_key);
 			ret = knot_tsig_key_init_str(&params->tsig_key, optarg);
 			if (ret != KNOT_EOK) return ret;
 			break;
 		case 'k':
+			knot_tsig_key_deinit(&params->tsig_key);
 			ret = knot_tsig_key_init_file(&params->tsig_key, optarg);
 			if (ret != KNOT_EOK) return ret;
 			break;