avcodec/wavarc: Fix k limit

The implementation does not support k=32

Fixes: shift exponent 32 is too large for 32-bit type 'unsigned int'
Fixes: 57976/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_WAVARC_fuzzer-5911925807775744

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

libavcodec/wavarc.c

@@ -205,7 +205,7 @@ static int decode_1dif(AVCodecContext *avctx,
         if (block_type < 4 && block_type >= 0) {
             k = 1 + (avctx->sample_fmt == AV_SAMPLE_FMT_S16P);
             k = get_urice(gb, k) + 1;
-            if (k > 32)
+            if (k >= 32)
                 return AVERROR_INVALIDDATA;
         }
 
@@ -297,7 +297,7 @@ static int decode_2slp(AVCodecContext *avctx,
         if (block_type < 5 && block_type >= 0) {
             k = 1 + (avctx->sample_fmt == AV_SAMPLE_FMT_S16P);
             k = get_urice(gb, k) + 1;
-            if (k > 32)
+            if (k >= 32)
                 return AVERROR_INVALIDDATA;
         }