sb_celp: avoid division by 0
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sb_celp: avoid division by 0
Co-authored by: Jean-Marc Valin jmvalin@jmvalin.ca
Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/speex
Fixes https://oss-fuzz.com/testcase-detail/6065027378905088 Fixes https://issues.oss-fuzz.com/issues/389329711