KVM: X86: Add 'else' to unify fastop and execute call path

It also helps eliminate some duplicated code.
Signed-off-by: Miaohe Lin <linmiaohe@huawei.com>
Reviewed-by: Sean Christopherson <sean.j.christopherson@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

arch/x86/kvm/emulate.c

@@ -5683,11 +5683,9 @@ int x86_emulate_insn(struct x86_emulate_ctxt *ctxt)
 		if (ctxt->d & Fastop) {
 			void (*fop)(struct fastop *) = (void *)ctxt->execute;
 			rc = fastop(ctxt, fop);
-			if (rc != X86EMUL_CONTINUE)
-				goto done;
-			goto writeback;
+		} else {
+			rc = ctxt->execute(ctxt);
 		}
-		rc = ctxt->execute(ctxt);
 		if (rc != X86EMUL_CONTINUE)
 			goto done;
 		goto writeback;