fix steal time MSR vmsd callback to proper opaque type

Convert steal time MSR vmsd callback pointer to proper X86CPU type.

Signed-off-by: Marcelo Tosatti <[email protected]>
Signed-off-by: Paolo Bonzini <[email protected]>
diff --git a/target-i386/machine.c b/target-i386/machine.c
index dc81cde..e568da2 100644
--- a/target-i386/machine.c
+++ b/target-i386/machine.c
@@ -330,9 +330,9 @@
 
 static bool steal_time_msr_needed(void *opaque)
 {
-    CPUX86State *cpu = opaque;
+    X86CPU *cpu = opaque;
 
-    return cpu->steal_time_msr != 0;
+    return cpu->env.steal_time_msr != 0;
 }
 
 static const VMStateDescription vmstate_steal_time_msr = {
@@ -341,7 +341,7 @@
     .minimum_version_id = 1,
     .minimum_version_id_old = 1,
     .fields      = (VMStateField []) {
-        VMSTATE_UINT64(steal_time_msr, CPUX86State),
+        VMSTATE_UINT64(env.steal_time_msr, X86CPU),
         VMSTATE_END_OF_LIST()
     }
 };