ape_decode_value_3900: check tmpk

Fixes division by 0

Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

libavcodec/apedec.c

@@ -518,9 +518,13 @@ static inline int ape_decode_value_3900(APEContext *ctx, APERice *rice)
     } else
         tmpk = (rice->k < 1) ? 0 : rice->k - 1;
 
-    if (tmpk <= 16 || ctx->fileversion < 3910)
+    if (tmpk <= 16 || ctx->fileversion < 3910) {
+        if (tmpk > 23) {
+            av_log(ctx->avctx, AV_LOG_ERROR, "Too many bits: %d\n", tmpk);
+            return AVERROR_INVALIDDATA;
+        }
         x = range_decode_bits(ctx, tmpk);
-    else if (tmpk <= 32) {
+    } else if (tmpk <= 32) {
         x = range_decode_bits(ctx, 16);
         x |= (range_decode_bits(ctx, tmpk - 16) << 16);
     } else {