[libpng16] Trivial reordering of libpng_read_fuzzer.cc
diff --git a/contrib/oss-fuzz/libpng_read_fuzzer.cc b/contrib/oss-fuzz/libpng_read_fuzzer.cc
index 1f12657..bcef68c 100644
--- a/contrib/oss-fuzz/libpng_read_fuzzer.cc
+++ b/contrib/oss-fuzz/libpng_read_fuzzer.cc
@@ -68,16 +68,17 @@
   }
 
   PngObjectHandler png_handler;
+  png_handler.png_ptr = nullptr;
+  png_handler.row_ptr = nullptr;
+  png_handler.info_ptr = nullptr;
+  png_handler.end_info_ptr = nullptr;
+
   png_handler.png_ptr = png_create_read_struct
     (PNG_LIBPNG_VER_STRING, nullptr, nullptr, nullptr);
   if (!png_handler.png_ptr) {
     return 0;
   }
 
-  png_handler.row_ptr = nullptr;
-  png_handler.info_ptr = nullptr;
-  png_handler.end_info_ptr = nullptr;
-
 #define PNG_CLEANUP
   if(png_handler.png_ptr) \
   { \