udhcpc: if got IP successfully, disable -n for future renewals

Signed-off-by: Justin Maggard <jmaggard10@gmail.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
diff --git a/networking/udhcp/dhcpc.c b/networking/udhcp/dhcpc.c
index fbb6457..ccc0393 100644
--- a/networking/udhcp/dhcpc.c
+++ b/networking/udhcp/dhcpc.c
@@ -637,6 +637,8 @@
 						perform_release(requested_ip, server_addr);
 					goto ret0;
 				}
+				/* future renew failures should not exit (JM) */
+				opt &= ~OPT_n;
 #if BB_MMU /* NOMMU case backgrounded earlier */
 				if (!(opt & OPT_f)) {
 					client_background();