[src] Minor optimization to hash fetching; this only calculates the hash value of the key if there are entries in the hash.
[src] Minor optimization to hash fetching; this only calculates the hash value
of the key if there are entries in the hash.

I *think* this code is C89-compliant, but if we have to predeclare the
variables and lose the const on the hashval, that's fine.

git-svn-id: 6e74a02f85675cec270f5d931b0f6998666294a3@22579 d31e2699-5ff4-0310-a27c-f18f2fbe73fe

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