ext/libpng/gstpngenc.c: Don't leak buffer data memory. Fixes #498395.

Original commit message from CVS:
Patch by: René Stadler <mail at renestadler dot de>
* ext/libpng/gstpngenc.c:
Don't leak buffer data memory. Fixes #498395.

ChangeLog

+2007-11-20  Stefan Kost  <ensonic@users.sf.net>
+
+	Patch by: René Stadler <mail at renestadler dot de>
+
+	* ext/libpng/gstpngenc.c:
+	  Don't leak buffer data memory. Fixes #498395.
+
 2007-11-20  Stefan Kost  <ensonic@users.sf.net>
 	Patch by: René Stadler <mail at renestadler dot de>

ext/libpng/gstpngenc.c

@@ -228,7 +228,8 @@ user_write_data (png_structp png_ptr, png_bytep data, png_uint_32 length)
   pngenc = (GstPngEnc *) png_get_io_ptr (png_ptr);
 
   buffer = gst_buffer_new ();
-  GST_BUFFER_DATA (buffer) = g_memdup (data, length);
+  GST_BUFFER_MALLOCDATA (buffer) = g_memdup (data, length);
+  GST_BUFFER_DATA (buffer) = GST_BUFFER_MALLOCDATA (buffer);
   GST_BUFFER_SIZE (buffer) = length;
 
   if (pngenc->buffer_out) {