Remove unnecessary forward declaration.

git-svn-id: file:///var/local/repositories/ffmpeg/trunk@11583 9553f0bf-9b14-0410-a0b8-cfaf0461ba5b

libavcodec/ac3enc.c

@@ -73,8 +73,6 @@ static int16_t xsin1[128];
 /* new exponents are sent if their Norm 1 exceed this number */
 #define EXP_DIFF_THRESHOLD 1000
 
-static void fft_init(int ln);
-
 static inline int16_t fix15(float a)
 {
     int v;