udhcpc[6]: downgrade "adapter index N" messages to log2 level

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
diff --git a/networking/udhcp/socket.c b/networking/udhcp/socket.c
index 4fd79f4..ec6a1dc 100644
--- a/networking/udhcp/socket.c
+++ b/networking/udhcp/socket.c
@@ -56,7 +56,7 @@
 			close(fd);
 			return -1;
 		}
-		log1("adapter index %d", ifr->ifr_ifindex);
+		log2("ifindex %d", ifr->ifr_ifindex);
 		*ifindex = ifr->ifr_ifindex;
 	}