avcodec/adpcmenc: remove BLKSIZE #define

Signed-off-by: Zane van Iperen <zane@zanevaniperen.com>

libavcodec/adpcm.h

@@ -28,8 +28,6 @@
 
 #include <stdint.h>
 
-#define BLKSIZE 1024
-
 typedef struct ADPCMChannelStatus {
     int predictor;
     int16_t step_index;

libavcodec/adpcmenc.c

@@ -857,7 +857,7 @@ static const AVOption options[] = {
         .help        = "set the block size",
         .offset      = offsetof(ADPCMEncodeContext, block_size),
         .type        = AV_OPT_TYPE_INT,
-        .default_val = {.i64 = BLKSIZE},
+        .default_val = {.i64 = 1024},
         .min         = 32,
         .max         = 8192, /* Is this a reasonable upper limit? */
         .flags       = AV_OPT_FLAG_ENCODING_PARAM | AV_OPT_FLAG_AUDIO_PARAM