avcodec/cbs_h264: silence errors about end_of_seq nalus

[ffmpeg] AVBSFContext: Decomposition unimplemented for unit 4 (type 10).

Signed-off-by: Aman Gupta <aman@tmm1.net>
(cherry picked from commit 64c50c0e978cd556dc2da238dfe0bb367e7c1ab9)

libavcodec/cbs_h2645.c

@@ -828,6 +828,9 @@ static int cbs_h264_read_nal_unit(CodedBitstreamContext *ctx,
         }
         break;
 
+    case H264_NAL_END_SEQUENCE:
+        return 0;
+
     default:
         return AVERROR(ENOSYS);
     }