avcodec/interplayacm: Check input for fill_block()

Fixes: Timeout
Fixes: 476763877/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_INTERPLAY_ACM_fuzzer-4515681843609600

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit 2ab23ec729)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

libavcodec/interplayacm.c

@@ -423,6 +423,9 @@ static int fill_block(InterplayACMContext *s)
     unsigned i, ind;
     int ret;
 
+    if (get_bits_left(gb) < s->cols * 5)
+        return AVERROR_INVALIDDATA;
+
     for (i = 0; i < s->cols; i++) {
         ind = get_bits(gb, 5);
         ret = filler_list[ind](s, ind, i);