temporary interrupt locking fix (need rework)


git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@598 c046a42c-6fe2-441c-8c8c-71466251a162
diff --git a/cpu-exec.c b/cpu-exec.c
index bd0cbb3..4e2d77f 100644
--- a/cpu-exec.c
+++ b/cpu-exec.c
@@ -142,6 +142,7 @@
     /* prepare setjmp context for exception handling */
     for(;;) {
         if (setjmp(env->jmp_env) == 0) {
+            env->current_tb = NULL;
             /* if an exception is pending, we execute it here */
             if (env->exception_index >= 0) {
                 if (env->exception_index >= EXCP_INTERRUPT) {