ip-address: fix oneline mode for interfaces with VF

Signed-off-by: Phil Sutter <phil@nwl.cc>
diff --git a/ip/ipaddress.c b/ip/ipaddress.c
index e864ca6..f290205 100644
--- a/ip/ipaddress.c
+++ b/ip/ipaddress.c
@@ -345,7 +345,7 @@
 	} else
 		vf_linkstate = NULL;
 
-	fprintf(fp, "\n    vf %d MAC %s", vf_mac->vf,
+	fprintf(fp, "%s    vf %d MAC %s", _SL_, vf_mac->vf,
 		ll_addr_n2a((unsigned char *)&vf_mac->mac,
 		ETH_ALEN, 0, b1, sizeof(b1)));
 	if (vf_vlan->vlan)