hkdf: fix compiler warning
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@ -22,7 +22,7 @@ int hkdf_extract(int hash_idx, const unsigned char *salt, unsigned long saltlen
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sense), we can use a single 0 byte as the HMAC key and still generate
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valid results for HKDF. */
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if (salt == NULL || saltlen == 0) {
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return hmac_memory(hash_idx, "", 1, in, inlen, out, outlen);
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return hmac_memory(hash_idx, (const unsigned char *)"", 1, in, inlen, out, outlen);
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} else {
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return hmac_memory(hash_idx, salt, saltlen, in, inlen, out, outlen);
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}
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