avcodec/golomb: Assert that k is valid in get_ur_golomb_jpegls()

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

libavcodec/golomb.h

@@ -314,6 +314,8 @@ static inline int get_ur_golomb_jpegls(GetBitContext *gb, int k, int limit,
 
     log = av_log2(buf);
 
+    av_assert2(k <= 31);
+
     if (log - k >= 32 - MIN_CACHE_BITS + (MIN_CACHE_BITS == 32) &&
         32 - log < limit) {
         buf >>= log - k;