Fix for keysz in 25519

Author: billphipps

src/wh_server_crypto.c

@@ -452,12 +452,12 @@ int wh_Server_CacheImportCurve25519Key(whServerContext* server,
     uint8_t*       cacheBuf;
     whNvmMetadata* cacheMeta;
     int            ret;
-    uint16_t       keySz        = keySz;
 
 #ifndef CURVE25519_MAX_KEY_TO_DER_SZ
 #define CURVE25519_MAX_KEY_TO_DER_SZ 128
 #endif
     uint8_t der_buf[CURVE25519_MAX_KEY_TO_DER_SZ];
+    uint16_t       keySz        = sizeof(der_buf);
 
 
     if ((server == NULL) || (key == NULL) || (WH_KEYID_ISERASED(keyId)) ||