Fix: INVALID_SOCKET usage in POSIX code and remove missing test

- control_server.c: Use -1 instead of INVALID_SOCKET on lines 241 and 511
- Makefile.am: Remove test_control_server reference (source file missing)

src/control_server.c

@@ -238,7 +238,7 @@ void control_server_shutdown(struct control_server* server) {
     }
     
     /* Close listening socket */
-    if (server->listen_fd != INVALID_SOCKET) {
+    if (server->listen_fd >= 0) {
         uasync_remove_socket_t(server->ua, server->listen_fd);
         server->listen_socket_id = NULL;
     }
@@ -508,7 +508,7 @@ static void close_client(struct control_server* server, struct control_client* c
     }
     
     /* Remove from uasync */
-    if (client->fd != INVALID_SOCKET) {
+    if (client->fd >= 0) {
         uasync_remove_socket_t(server->ua, client->fd);
     }
     

tests/Makefile.am

@@ -23,7 +23,6 @@ check_PROGRAMS = \
 	test_route_lib \
 	test_bgp_route_exchange \
  test_routing_mesh \
- test_control_server \
 	bench_timeout_heap \
 	bench_uasync_timeouts
 
@@ -205,11 +204,6 @@ bench_uasync_timeouts_SOURCES = bench_uasync_timeouts.c
 bench_uasync_timeouts_CFLAGS = -I$(top_srcdir)/lib
 bench_uasync_timeouts_LDADD = $(COMMON_LIBS)
 
-# Control Server Test - Tests the ETCP monitoring protocol
-test_control_server_SOURCES = test_control_server.c
-test_control_server_CFLAGS = -I$(top_srcdir)/src -I$(top_srcdir)/lib -I$(top_srcdir)/tools/etcpmon
-test_control_server_LDADD = $(COMMON_LIBS)
-
 # Build tinycrypt objects before tests that need them
 BUILT_SOURCES = $(TINYCRYPT_BUILT)