avformat/tests/imf: Don't use uninitialized value

Reviewed-by: Zane van Iperen <zane@zanevaniperen.com>
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>

libavformat/tests/imf.c

@@ -347,7 +347,7 @@ static int test_bad_cpl_parsing(void)
     doc = xmlReadMemory(cpl_bad_doc, strlen(cpl_bad_doc), NULL, NULL, 0);
     if (doc == NULL) {
         printf("XML parsing failed.\n");
-        return ret;
+        return 1;
     }
 
     ret = ff_imf_parse_cpl_from_xml_dom(doc, &cpl);