Simplified preferredencoding()

Not sure what is the point to use yield to return encoding, thus
it will simplify the whole function.

Signed-off-by: Arvydas Sidorenko <asido4@gmail.com>

youtube_dl/utils.py

@@ -32,15 +32,13 @@ def preferredencoding():
 	Returns the best encoding scheme for the system, based on
 	locale.getpreferredencoding() and some further tweaks.
 	"""
-	def yield_preferredencoding():
 	try:
 		pref = locale.getpreferredencoding()
 		u'TEST'.encode(pref)
 	except:
 		pref = 'UTF-8'
-		while True:
-			yield pref
-	return yield_preferredencoding().next()
+
+	return pref
 
 
 def htmlentity_transform(matchobj):