Add a notice telling that the behavior of skip_put_bits() is undefined

if n is 0.


git-svn-id: file:///var/local/repositories/ffmpeg/trunk@18285 9553f0bf-9b14-0410-a0b8-cfaf0461ba5b

libavcodec/bitstream.h

@@ -337,6 +337,7 @@ static inline void skip_put_bytes(PutBitContext *s, int n){
 /**
  * Skips the given number of bits.
  * Must only be used if the actual values in the bitstream do not matter.
+ * If \p n is 0 the behavior is undefined.
  */
 static inline void skip_put_bits(PutBitContext *s, int n){
 #ifdef ALT_BITSTREAM_WRITER