hdaR3WalClkSet compile bug in non VBOX_STRICT

[gim]

VirtualBox/src/VBox/Devices/Audio/DevHDACommon.cpp: In function ‘bool hdaR3WalClkSet(PHDASTATE, uint64_t, bool)’:
VirtualBox/src/VBox/Devices/Audio/DevHDACommon.cpp:183:15: error: ‘u64WalClkCur’ was not declared in this scope
               u64WalClkCur, u64WalClk, fForce,

u64WalClkCur will be defined only when VBOX_STRICT defined

bool hdaR3WalClkSet(PHDASTATE pThis, uint64_t u64WalClk, bool fForce)
{
...

# ifdef VBOX_STRICT
    const uint64_t u64WalClkCur       = ASMAtomicReadU64(&pThis->u64WalClk);
# endif

...
    const uint64_t u64WalClkNew = hdaWalClkGetCurrent(pThis);

    Log3Func(("Cur: %RU64, New: %RU64 (force %RTbool) -> %RU64 %s\n",
              u64WalClkCur, u64WalClk, fForce,
              u64WalClkNew, u64WalClkNew == u64WalClk ? "[OK]" : "[DELAYED]"));

    return (u64WalClkNew == u64WalClk);
}