Only fail on memory allocation after initializing other variables (#747)

As this issue was not reproducible, this might not actually be a
fix.

Credit: Oss-Fuzz
Issue: https://issues.oss-fuzz.com/issues/42538252

src/flac/main.c

@@ -658,16 +658,16 @@ FLAC__bool init_options(void)
 
 	option_values.num_files = 0;
 	option_values.filenames = 0;
-
-	if(0 == (option_values.vorbis_comment = FLAC__metadata_object_new(FLAC__METADATA_TYPE_VORBIS_COMMENT)))
-		return false;
 	option_values.num_pictures = 0;
 
 	option_values.debug.disable_constant_subframes = false;
 	option_values.debug.disable_fixed_subframes = false;
 	option_values.debug.disable_verbatim_subframes = false;
 	option_values.debug.do_md5 = true;
 
+	if(0 == (option_values.vorbis_comment = FLAC__metadata_object_new(FLAC__METADATA_TYPE_VORBIS_COMMENT)))
+		return false;
+
 	return true;
 }