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sdl2: safe chanclose

--- a/libnpe_sdl2/audio.c

+++ b/libnpe_sdl2/audio.c

@@ -224,8 +224,10 @@

 	}

 	free(a->buf);

 	a->buf = nil;

-	chanfree(a->wait);

-	a->wait = nil;

+	if(a->wait != nil){

+		chanfree(a->wait);

+		a->wait = nil;

+	}

 	return 0;

 }

--- a/libnpe_sdl2/threads.c

+++ b/libnpe_sdl2/threads.c

@@ -29,8 +29,9 @@

 	t->userdata = data;

 	t->wait = chancreate(sizeof(int), 0);

-	if(proccreate(sdlthread, t, stacksz) < 0){

-		chanfree(t->wait);

+	if(t->wait == nil || proccreate(sdlthread, t, stacksz) < 0){

+		if(t->wait != nil)

+			chanfree(t->wait);

 		free(t);

 		t = nil;

 	}

@@ -47,7 +48,8 @@

 void

 SDL_DetachThread(SDL_Thread *t)

 {

-	chanclose(t->wait);

+	if(t != nil)

+		chanclose(t->wait);

 }

 void

@@ -55,9 +57,11 @@

 {

 	int r;

-	recv(t->wait, &r);

-	if(status != nil)

-		*status = r;

+	if(t != nil){

+		recv(t->wait, &r);

+		if(status != nil)

+			*status = r;

+	}

 }

 void