KVM: vVMX: rename label for post-enter_guest_mode consistency check

Rename 'fail' to 'vmentry_fail_vmexit_guest_mode' to make it more
obvious that it's simply a different entry point to the VMExit path,
whose purpose is unwind the updates done prior to calling
prepare_vmcs02().

Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
Reviewed-by: Jim Mattson <jmattson@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>