Fixes: shift exponent 1008 is too large for 32-bit type 'int'
Fixes: 17700/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_G723_1_fuzzer-5707633436131328

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpegSigned-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit 07732f12)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>