fix a typo

Originally committed as revision 12879 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/avcodec.h

@@ -2239,7 +2239,7 @@ typedef struct AVCodec {
      */
     void (*flush)(AVCodecContext *);
     const AVRational *supported_framerates; ///< array of supported framerates, or NULL if any, array is terminated by {0,0}
-    const enum PixelFormat *pix_fmts;       ///< array of supported pixel formats, or NULL if unknown, array is terminanted by -1
+    const enum PixelFormat *pix_fmts;       ///< array of supported pixel formats, or NULL if unknown, array is terminated by -1
     const char *long_name;                  ///< descriptive name for the codec, meant to be more human readable than \p name
 } AVCodec;