Remove unneeded add bias from 3 functions.

DSPContext.vector_fmul_window()
DCADSPContext.lfe_fir()
SynthFilterContext.synth_filter_float()

Signed-off-by: Mans Rullgard <mans@mansr.com>

libavcodec/dcadsp.h

@@ -21,7 +21,7 @@
 
 typedef struct DCADSPContext {
     void (*lfe_fir)(float *out, const float *in, const float *coefs,
-                    int decifactor, float scale, float bias);
+                    int decifactor, float scale);
 } DCADSPContext;
 
 void ff_dcadsp_init(DCADSPContext *s);