- Fixed false positive when using typeof/__alignof__

This patch fixes false positive which I've found when using cppcheck on the Kernel source.
I just checked it fixes some reports like:

```
[../linux/arch/x86/kernel/kvm.c:111]: (error) Uninitialized variable: n
[../linux/arch/x86/kernel/kvm.c:194]: (error) Uninitialized variable: n
[../linux/arch/arm/mm/mmu.c:829]: (error) Uninitialized variable: svm
[../linux/arch/arm/mm/mmu.c:851]: (error) Uninitialized variable: svm
```