[nq] Fix some level change segfaults

I really need to play more while working on the code.

Anyway, ca_active works nicely for the status bar in general, and
CL_ClearMemory needs to be called before Host_ClearMemory when doing
single-player.

nq/include/host.h

@@ -56,6 +56,8 @@ extern	double		realtime;			// not bounded in any way, changed at
 extern struct cbuf_s *host_cbuf;
 
 void Host_ClearMemory (void);
+void Host_SpawnServer (void);
+void Host_OnServerSpawn (void (*onSpawn)(void));
 void Host_ServerFrame (void);
 void Host_InitCommands (void);
 void Host_Init (void);

nq/source/cl_main.c

@@ -625,6 +625,8 @@ CL_Init (cbuf_t *cbuf)
 	if (!colormap)
 		Sys_Error ("Couldn't load gfx/colormap.lmp");
 
+	Host_OnServerSpawn (CL_ClearMemory);
+
 	W_LoadWadFile ("gfx.wad");
 	VID_Init (basepal, colormap);
 	IN_Init ();

nq/source/host.c

@@ -42,6 +42,7 @@
 #include "QF/image.h"
 #include "QF/input.h"
 #include "QF/keys.h"
+#include "QF/listener.h"
 #include "QF/msg.h"
 #include "QF/png.h"
 #include "QF/progs.h"
@@ -632,6 +633,22 @@ Host_ClearMemory (void)
 		Hunk_FreeToLowMark (0, host_hunklevel);
 }
 
+static struct LISTENER_SET_TYPE(void) host_server_spawn = LISTENER_SET_STATIC_INIT(4);
+
+void
+Host_SpawnServer (void)
+{
+	LISTENER_INVOKE (&host_server_spawn, NULL);
+	Host_ClearMemory ();
+}
+
+void
+Host_OnServerSpawn (void (*onSpawn) (void))
+{
+	LISTENER_ADD (&host_server_spawn,
+				  (void(*)(void *, const void*)) onSpawn, 0);
+}
+
 /*
 	Host_FilterTime
 

nq/source/sbar.c

@@ -1003,7 +1003,9 @@ sbar_update_vis (void)
 void
 Sbar_Draw (void)
 {
-	if (!cl.players) return;	//FIXME draw_miniteam
+	if (cls.state != ca_active) {
+		return;
+	}
 	sbar_update_vis ();
 	hud_main_view->draw (hud_main_view);
 }

nq/source/sv_main.c

@@ -1113,7 +1113,7 @@ SV_SpawnServer (const char *server)
 	skill = current_skill;
 
 	// set up the new server
-	Host_ClearMemory ();
+	Host_SpawnServer ();
 
 	memset (&sv, 0, sizeof (sv));