avformat/wsddec: Fix undefined shift

Fixes: left shift of 1 by 31 places cannot be represented in type 'int'
Fixes: 15123/clusterfuzz-testcase-minimized-ffmpeg_DEMUXER_fuzzer-5738039235575808

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpegSigned-off-by: Michael Niedermayer <michael@niedermayer.cc>

libavformat/wsddec.c

@@ -137,7 +137,7 @@ static int wsd_read_header(AVFormatContext *s)
     if (!(channel_assign & 1)) {
         int i;
         for (i = 1; i < 32; i++)
-            if (channel_assign & (1 << i))
+            if ((channel_assign >> i) & 1)
                 st->codecpar->channel_layout |= wsd_to_av_channel_layoyt(s, i);
     }