[extractor/freesound] Workaround invalid URL in webpage (#6147)

Authored by: rebane2001
Closes #6146

yt_dlp/extractor/freesound.py

@@ -52,6 +52,7 @@ class FreesoundIE(InfoExtractor):
         tags_str = get_element_by_class('tags', webpage)
         tags = re.findall(r'<a[^>]+>([^<]+)', tags_str) if tags_str else None
 
+        audio_url = re.sub(r'^https?://freesound\.org(https?://)', r'\1', audio_url)
         audio_urls = [audio_url]
 
         LQ_FORMAT = '-lq.mp3'