avcodec/mpeg12dec: remove outdated comments

Found-by: Kieran
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit 48de8f5816)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

libavcodec/mpeg12dec.c

@@ -220,7 +220,6 @@ end:
 }
 
 /**
- * Note: this function can read out of range and crash for corrupt streams.
  * Changing this would eat up any speed benefits it has.
  * Do not use "fast" flag if you need the code to be robust.
  */
@@ -396,7 +395,6 @@ end:
 }
 
 /**
- * Note: this function can read out of range and crash for corrupt streams.
  * Changing this would eat up any speed benefits it has.
  * Do not use "fast" flag if you need the code to be robust.
  */
@@ -558,7 +556,6 @@ static inline int mpeg2_decode_block_intra(MpegEncContext *s,
 }
 
 /**
- * Note: this function can read out of range and crash for corrupt streams.
  * Changing this would eat up any speed benefits it has.
  * Do not use "fast" flag if you need the code to be robust.
  */