Bug in hash table when key is PJ_HASH_KEY_STRING and hval is specified (thanks ChenHuan)

[bennylp]

To reproduce:

    char *key = "hello";
    unsigned hval = 12345;
    pj_hash_set(pool, ht, key, PJ_HASH_KEY_STRING, hval, 1);
    pj_hash_set(pool, ht, key, PJ_HASH_KEY_STRING, hval, 2);

Upon second pj_hash_set() invocation, the function will crash because when hval is specified the key length is not calculated, causing memcmp() to be called with -1 argument.

Note that this does not affect PJSIP since PJSIP never uses PJ_HASH_KEY_STRING.

Thanks ChenHuan <chenhuan at sict.ac.cn>.

[bennylp]

Fixed in r1185.