add trivial nil checks to some of the cleanup procedures.

1 files changed, 2 insertions, 0 deletions

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);
 }