target-s390x: correctly initialize ext interrupt queue

env->ext_index should be initialized to -1 to mark the external
interrupt queue as emtpy. This should not be done in s390_cpu_initfn
as all the interrupt fields are later reset to 0 by the memset in
s390_cpu_initial_reset or s390_cpu_full_reset. Move the initialization
there.
Signed-off-by: NAurelien Jarno <aurelien@aurel32.net>
Signed-off-by: NAlexander Graf <agraf@suse.de>

target-s390x/cpu.c

@@ -117,6 +117,7 @@ static void s390_cpu_initial_reset(CPUState *s)
     env->cregs[14] = CR14_RESET;
 
     env->pfault_token = -1UL;
+    env->ext_index = -1;
 
     /* tininess for underflow is detected before rounding */
     set_float_detect_tininess(float_tininess_before_rounding,
@@ -146,6 +147,7 @@ static void s390_cpu_full_reset(CPUState *s)
     env->cregs[14] = CR14_RESET;
 
     env->pfault_token = -1UL;
+    env->ext_index = -1;
 
     /* tininess for underflow is detected before rounding */
     set_float_detect_tininess(float_tininess_before_rounding,
@@ -207,7 +209,6 @@ static void s390_cpu_initfn(Object *obj)
     s390_cpu_set_state(CPU_STATE_STOPPED, cpu);
 #endif
     env->cpu_num = cpu_num++;
-    env->ext_index = -1;
 
     if (tcg_enabled() && !inited) {
         inited = true;