ntoskrnl.exe: Fix incorrect interpretation of SIB byte when parsing x86 opcode.

[Sebastian Lackner]

I hope this issue is obvious enough without writing tests for that. ;)

Layout of the SIB byte should be:
* bits 0-2 base
* bits 3-5 index
* bits 6-7 scale

The current incorrect implementation has the effect, that when the scale bits are set, the index is not recognized anymore.

---
 dlls/ntoskrnl.exe/instr.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
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