KVM: x86 emulator: Fix nop emulation

If a nop instruction is encountered, we jump directly to the done label.
This skip updating rip. Break from the switch case instead

Signed-off-by: Mohammed Gamal <m.gamal005@gmail.com>
Signed-off-by: Avi Kivity <avi@redhat.com>

arch/x86/kvm/emulate.c

@@ -2912,7 +2912,7 @@ special_insn:
 		break;
 	case 0x90 ... 0x97: /* nop / xchg reg, rax */
 		if (c->dst.addr.reg == &c->regs[VCPU_REGS_RAX])
-			goto done;
+			break;
 		goto xchg;
 	case 0x9c: /* pushf */
 		c->src.val =  (unsigned long) ctxt->eflags;