cosmetics: indentation and spacing

(cherry picked from commit b5ec6383)

libavcodec/ac3dec.c

@@ -195,7 +195,7 @@ static av_cold int ac3_decode_init(AVCodecContext *avctx)
     dsputil_init(&s->dsp, avctx);
     av_lfg_init(&s->dith_state, 0);
 
-    /* set bias values for float to int16 conversion */
+    /* set scale value for float to int16 conversion */
     s->mul_bias = 32767.0f;
 
     /* allow downmixing to stereo or mono */

libavcodec/dca.c

@@ -1846,7 +1846,6 @@ static av_cold int dca_decode_init(AVCodecContext * avctx)
         avctx->channels = avctx->request_channels;
     }
 
-
     return 0;
 }
 

libavcodec/wmadec.c

@@ -792,7 +792,7 @@ static int wma_decode_frame(WMACodecContext *s, int16_t *samples)
     for (ch = 0; ch < MAX_CHANNELS; ch++)
         output[ch] = s->frame_out[ch];
     s->dsp.float_to_int16_interleave(samples, output, n, incr);
-        for(ch = 0; ch < incr; ch++) {
+    for (ch = 0; ch < incr; ch++) {
         /* prepare for next block */
         memmove(&s->frame_out[ch][0], &s->frame_out[ch][n], n * sizeof(float));
     }