cpu: Move opaque field from CPU_COMMON to CPUState

Signed-off-by: Andreas Färber <afaerber@suse.de>
diff --git a/bsd-user/main.c b/bsd-user/main.c
index f9246aa..f81ba55 100644
--- a/bsd-user/main.c
+++ b/bsd-user/main.c
@@ -1000,7 +1000,7 @@
     memset(ts, 0, sizeof(TaskState));
     init_task_state(ts);
     ts->info = info;
-    env->opaque = ts;
+    cpu->opaque = ts;
 
 #if defined(TARGET_I386)
     cpu_x86_set_cpl(env, 3);