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Annotate false positive overflow_const issues (CID #1604607, #1604626) #5358

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Coverity sees the initialization of hash and the multiplication by FNV_MAGIC_PRIME and points out that the product is too large for a uint32_t, but because the multiplication is done in an unsigned type, that is defined behavior and the intended behavior for the hash functions.

Coverity sees the initialization of hash and the multiplication by
FNV_MAGIC_PRIME and points out that the product is too large for a
uint32_t, but because the multiplication is done in an unsigned type,
that is defined behavior and the intended behavior for the hash
functions.
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