Fixed the loading of OGG files which have no metadata.

src/seg009.c

@@ -2190,8 +2190,10 @@ sound_buffer_type* load_sound(int index) {
 				// Decoding the entire file immediately would make the loading time much longer.
 				// However, we can also create the decoder now, and only use it when we are actually playing the file.
 				// (In the audio callback, we'll decode chunks of samples to the output stream, as needed).
-				stb_vorbis* decoder = stb_vorbis_open_memory(file_contents, (int)file_size, NULL, NULL);
+				int error = 0;
+				stb_vorbis* decoder = stb_vorbis_open_memory(file_contents, (int)file_size, &error, NULL);
 				if (decoder == NULL) {
+					printf("Error %d when creating decoder from file \"%s\"!\n", error, filename);
 					free(file_contents);
 					break;
 				}

src/stb_vorbis.c

@@ -3646,7 +3646,8 @@ static int start_decoder(vorb *f)
    //user comments
    f->comment_list_length = get32_packet(f);
    f->comment_list = (char**)setup_malloc(f, sizeof(char*) * (f->comment_list_length));
-   if (f->comment_list == NULL)                     return error(f, VORBIS_outofmem);
+   // David: If comment_list_length == 0 (there is no metadata) then malloc will always return NULL, but that's not an error.
+   if (f->comment_list_length != 0 && f->comment_list == NULL)                     return error(f, VORBIS_outofmem);
 
    for(i=0; i < f->comment_list_length; ++i) {
       len = get32_packet(f);