stb_vorbis: Add clearer error messages when failing to import OGG file

Fixes #56895.

modules/stb_vorbis/audio_stream_ogg_vorbis.cpp

@@ -185,8 +185,8 @@ void AudioStreamOGGVorbis::set_data(const PoolVector<uint8_t> &p_data) {
 			w.release();
 			alloc_try *= 2;
 		} else {
-			ERR_FAIL_COND(alloc_try == MAX_TEST_MEM);
-			ERR_FAIL_COND(ogg_stream == nullptr);
+			ERR_FAIL_COND_MSG(alloc_try == MAX_TEST_MEM, "Failed allocating memory for OGG Vorbis stream.");
+			ERR_FAIL_COND_MSG(!ogg_stream, "OGG Vorbis decoding failed. Check that your data is a valid OGG Vorbis audio stream.");
 
 			stb_vorbis_info info = stb_vorbis_get_info(ogg_stream);
 

modules/stb_vorbis/resource_importer_ogg_vorbis.cpp

@@ -91,7 +91,7 @@ Error ResourceImporterOGGVorbis::import(const String &p_source_file, const Strin
 	ogg_stream.instance();
 
 	ogg_stream->set_data(data);
-	ERR_FAIL_COND_V(!ogg_stream->get_data().size(), ERR_FILE_CORRUPT);
+	ERR_FAIL_COND_V_MSG(!ogg_stream->get_data().size(), ERR_FILE_CORRUPT, "Couldn't import file as AudioStreamOGGVorbis: " + p_source_file);
 	ogg_stream->set_loop(loop);
 	ogg_stream->set_loop_offset(loop_offset);