God, this might be workable at some point

src/testserver.c

@@ -3,6 +3,7 @@
 #include <string.h>
 #include <stdarg.h>
 #include <sys/select.h>
+#include <errno.h>
 
 #include <patty/ax25.h>
 
@@ -41,15 +42,19 @@ int main(int argc, char **argv) {
         goto error_server_add_if;
     }
 
-    patty_ax25_server_run(server);
+    if (patty_ax25_server_run(server) < 0) {
+        fprintf(stderr, "%s: %s: %s: %s\n",
+            argv[0], argv[1], "patty_ax25_server_run()", strerror(errno));
+
+            goto error_server_run;
+    }
 
     patty_ax25_server_destroy(server);
 
     return 0;
 
+error_server_run:
 error_server_add_if:
-    patty_ax25_if_destroy(iface);
-
 error_if_new:
     patty_ax25_server_destroy(server);