Ensure that metadata pointer is initially set to NULL

Xarthisius · Xarthisius · commit 5200afff883c · 2016-12-25T07:48:07.000-06:00
diff --git a/src/_png.cpp b/src/_png.cpp
@@ -124,7 +124,7 @@ static PyObject *Py_write_png(PyObject *self, PyObject *args, PyObject *kwds)
 {
     numpy::array_view<unsigned char, 3> buffer;
     PyObject *filein;
-    PyObject *metadata;
+    PyObject *metadata = NULL;
     PyObject *meta_key, *meta_val;
     png_text *text;
     Py_ssize_t pos = 0;

Original file line number	Diff line number	Diff line change
`@@ -124,7 +124,7 @@ static PyObject Py_write_png(PyObject self, PyObject args, PyObject kwds)`
`124`	`124`	`{`
`125`	`125`	`numpy::array_view<unsigned char, 3> buffer;`
`126`	`126`	`PyObject *filein;`
`127`		`- PyObject *metadata;`
	`127`	`+ PyObject *metadata = NULL;`
`128`	`128`	`PyObject meta_key, meta_val;`
`129`	`129`	`png_text *text;`
`130`	`130`	`Py_ssize_t pos = 0;`