avcodec/adpcm: Check init_get_bits8() for failure

Fixes CID1322317
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

libavcodec/adpcm.c

@@ -775,7 +775,9 @@ static int adpcm_decode_frame(AVCodecContext *avctx, void *data,
             int samples_per_block = ff_adpcm_ima_block_samples[avctx->bits_per_coded_sample - 2];
             GetBitContext g;
 
-            init_get_bits8(&g, gb.buffer, bytestream2_get_bytes_left(&gb));
+            ret = init_get_bits8(&g, gb.buffer, bytestream2_get_bytes_left(&gb));
+            if (ret < 0)
+                return ret;
             for (n = 0; n < (nb_samples - 1) / samples_per_block; n++) {
                 for (i = 0; i < avctx->channels; i++) {
                     cs = &c->status[i];