Don't duplicate error messages on send failure

We have a warn in send_arp_packet, no need to warn again. Also, sleep()
isn't any use here.

Signed-off-by: Jeremy Kerr <jk@ozlabs.org>
diff --git a/inarp.c b/inarp.c
index 3e8ba2c..6301867 100644
--- a/inarp.c
+++ b/inarp.c
@@ -225,17 +225,13 @@
 		if (ret)
 			continue;
 
-		ret = send_arp_packet(fd, ifindex, &inarp_resp,
+		send_arp_packet(fd, ifindex, &inarp_resp,
 				    ARPOP_InREPLY,
 				    inarp_req->dest_mac,
 				    &local_ip,
 				    inarp_req->src_mac,
 				    &inarp_req->src_ip);
-		if (ret < 0) {
-			warn("Error sending response");
-			sleep(1);
-			continue;
-		}
+
 		memset(buffer, 0, sizeof(buffer));
 	}
 	close(fd);