wifi_sim.c:fix compile warning

Signed-off-by: wangchen <wangchen41@xiaomi.com>
diff --git a/drivers/net/wifi_sim.c b/drivers/net/wifi_sim.c
index baadc2d..752eebb 100644
--- a/drivers/net/wifi_sim.c
+++ b/drivers/net/wifi_sim.c
@@ -1029,7 +1029,7 @@
               pwrq->u.sens.value = -wifidev->connected_ap->RSSI;
             }
 
-          ninfo("get rssi is %d\n", pwrq->u.sens.value);
+          ninfo("get rssi is %" PRId32 "\n", pwrq->u.sens.value);
         }
         break;