iproute: fix parsing and matching of of "short" IP addrs like 10/8

function                                             old     new   delta
print_route                                         1613    1813    +200
get_addr_1                                           209     258     +49
get_prefix                                           393     356     -37
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 2/1 up/down: 249/-37)           Total: 212 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
diff --git a/networking/libiproute/libnetlink.c b/networking/libiproute/libnetlink.c
index 547013f..c7533a4 100644
--- a/networking/libiproute/libnetlink.c
+++ b/networking/libiproute/libnetlink.c
@@ -393,7 +393,7 @@
 		if (rta->rta_type <= max) {
 			tb[rta->rta_type] = rta;
 		}
-		rta = RTA_NEXT(rta,len);
+		rta = RTA_NEXT(rta, len);
 	}
 	if (len) {
 		bb_error_msg("deficit %d, rta_len=%d!", len, rta->rta_len);