From 4905acc20a161fff5eadf388251bbc7aa68b3ea6 Mon Sep 17 00:00:00 2001
From: Olaf Schumann <o.j.schumann@gmail.com>
Date: Thu, 13 Jan 2022 10:20:39 +0100
Subject: [PATCH] fix memory leak in output_png()

---
 src/plot.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/plot.cpp b/src/plot.cpp
index 93635a44b..c24a023f2 100644
--- a/src/plot.cpp
+++ b/src/plot.cpp
@@ -745,7 +745,7 @@ void output_png(Plot const& pl, const ImageData& data)
   // Clean up data structures
   std::fclose(fp);
   png_free_data(png_ptr, info_ptr, PNG_FREE_ALL, -1);
-  png_destroy_write_struct(&png_ptr, nullptr);
+  png_destroy_write_struct(&png_ptr, &info_ptr);
 }
 #endif