opus: merge encoder and decoder bitallocation functions into one

There's no difference apart from which entropy coding functions get called.
Signed-off-by: Rostislav Pehlivanov <atomnuker@gmail.com>

libavcodec/opus.h

@@ -194,4 +194,7 @@ int ff_silk_decode_superframe(SilkContext *s, OpusRangeCoder *rc,
 /* Encode or decode CELT bands */
 void ff_celt_quant_bands(CeltFrame *f, OpusRangeCoder *rc);
 
+/* Encode or decode CELT bitallocation */
+void ff_celt_bitalloc(CeltFrame *f, OpusRangeCoder *rc, int encode);
+
 #endif /* AVCODEC_OPUS_H */

libavcodec/opusenc.h

@@ -51,6 +51,4 @@ typedef struct OpusPacketInfo {
     int frames;
 } OpusPacketInfo;
 
-void ff_celt_enc_bitalloc(CeltFrame *f, OpusRangeCoder *rc);
-
 #endif /* AVCODEC_OPUSENC_H */

libavcodec/opusenc_psy.c

@@ -366,7 +366,7 @@ static int bands_dist(OpusPsyContext *s, CeltFrame *f, float *total_dist)
     OpusRangeCoder dump;
 
     ff_opus_rc_enc_init(&dump);
-    ff_celt_enc_bitalloc(f, &dump);
+    ff_celt_bitalloc(f, &dump, 1);
 
     for (i = 0; i < CELT_MAX_BANDS; i++) {
         float bits = 0.0f;