KVM: x86 emulator: rename decode_cache::eip to _eip

The name eip conflicts with a field of the same name in x86_emulate_ctxt,
which we plan to fold decode_cache into.

The name _eip is unfortunate, but what's really needed is a refactoring
here, not a better name.

Signed-off-by: Avi Kivity <avi@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
diff --git a/arch/x86/kvm/trace.h b/arch/x86/kvm/trace.h
index db93276..d69e758 100644
--- a/arch/x86/kvm/trace.h
+++ b/arch/x86/kvm/trace.h
@@ -677,7 +677,7 @@
 	TP_fast_assign(
 		__entry->rip = vcpu->arch.emulate_ctxt.decode.fetch.start;
 		__entry->csbase = kvm_x86_ops->get_segment_base(vcpu, VCPU_SREG_CS);
-		__entry->len = vcpu->arch.emulate_ctxt.decode.eip
+		__entry->len = vcpu->arch.emulate_ctxt.decode._eip
 			       - vcpu->arch.emulate_ctxt.decode.fetch.start;
 		memcpy(__entry->insn,
 		       vcpu->arch.emulate_ctxt.decode.fetch.data,