ARP: Fix bid conversion from msec to nsec

net/arp/arp_notify.c

@@ -196,6 +196,10 @@ int arp_wait(FAR struct arp_notify_s *notify, FAR struct timespec *timeout)
       abstime.tv_nsec -= 1000000000;
     }
 
+   /* REVISIT:  If sem_timedwait() is awakened with  signal, we will return
+    * the wrong error code.
+    */
+
   (void)sem_timedwait(&notify->nt_sem, &abstime);
   ret = notify->nt_result;
 

net/arp/arp_send.c

@@ -65,7 +65,7 @@
 #define CONFIG_ARP_SEND_DELAYSEC  \
   (CONFIG_ARP_SEND_DELAYMSEC / 1000)
 #define CONFIG_ARP_SEND_DELAYNSEC \
-  ((CONFIG_ARP_SEND_DELAYMSEC - 1000*CONFIG_ARP_SEND_DELAYSEC) / 1000000)
+  ((CONFIG_ARP_SEND_DELAYMSEC - 1000*CONFIG_ARP_SEND_DELAYSEC) * 1000000)
 
 /****************************************************************************
  * Private Types