bgmc: Do not mark ff_bgmc_decode_init() as av_cold

The function is possibly called once per block.

libavcodec/bgmc.c

@@ -485,7 +485,7 @@ av_cold void ff_bgmc_end(uint8_t **cf_lut, int **cf_lut_status)
 
 
 /** Initialize decoding and reads the first value */
-av_cold void ff_bgmc_decode_init(GetBitContext *gb, unsigned int *h,
+void ff_bgmc_decode_init(GetBitContext *gb, unsigned int *h,
                          unsigned int *l, unsigned int *v)
 {
     *h = TOP_VALUE;