add trivial nil checks to some of the cleanup procedures.

2 files changed, 10 insertions, 1 deletions

diff --git a/scene.c b/scene.c
index 6abae09..cb890a5 100644
--- a/scene.c
+++ b/scene.c
@@ -117,6 +117,8 @@ newmodel(void)
 void
 delmodel(Model *m)
 {
+	if(m == nil)
+		return;
 	if(m->obj != nil)
 		objfree(m->obj);
 	if(m->tex != nil)
@@ -146,7 +148,10 @@ newentity(Model *m)
 void
 delentity(Entity *e)
 {
-	delmodel(e->mdl);
+	if(e == nil)
+		return;
+	if(e->mdl != nil)
+		delmodel(e->mdl);
 	free(e);
 }
 
@@ -176,6 +181,8 @@ newscene(char *name)
 void
 delscene(Scene *s)
 {
+	if(s == nil)
+		return;
 	clearscene(s);
 	free(s->name);
 	free(s);
diff --git a/viewport.c b/viewport.c
index 7f963a8..9feffaa 100644
--- a/viewport.c
+++ b/viewport.c
@@ -52,6 +52,8 @@ mkviewport(Rectangle r)
 void
 rmviewport(Viewport *v)
 {
+	if(v == nil)
+		return;
 	rmfbctl(v->fbctl);
 	free(v);
 }