test: Free resources in pdf2png

Patch proposed by Bofa.

Fixes: https://gitlab.freedesktop.org/cairo/cairo/issues/317
Reviewed-by: Bryce Harrington <[email protected]>

Author: bryceharrington

test/pdf2png.c

@@ -67,10 +67,12 @@ int main (int argc, char *argv[])
 	FAIL (error->message);
 
     document = poppler_document_new_from_file (uri, NULL, &error);
+    g_free (uri);
     if (document == NULL)
 	FAIL (error->message);
 
     page = poppler_document_get_page_by_label (document, page_label);
+    g_object_unref (document);
     if (page == NULL)
 	FAIL ("page not found");