KVM: x86: fix shift out of bounds reported by UBSAN
Since we know that e >= s, we can reassociate the left shift, changing the shifted number from 1 to 2 in exchange for decreasing the right hand side by 1. Reported-by:<syzbot+e87846c48bf72bc85311@syzkaller.appspotmail.com> Signed-off-by:
Paolo Bonzini <pbonzini@redhat.com>
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