[cleanup] Convert XMALLOC/memset to XCALLOC

Simple conversion of XMALLOC/memset to XCALLOC
diff --git a/ospf6d/ospf6_interface.c b/ospf6d/ospf6_interface.c
index 8d9a7f0..4215208 100644
--- a/ospf6d/ospf6_interface.c
+++ b/ospf6d/ospf6_interface.c
@@ -96,11 +96,9 @@
   unsigned int iobuflen;
 
   oi = (struct ospf6_interface *)
-    XMALLOC (MTYPE_OSPF6_IF, sizeof (struct ospf6_interface));
+    XCALLOC (MTYPE_OSPF6_IF, sizeof (struct ospf6_interface));
 
-  if (oi)
-    memset (oi, 0, sizeof (struct ospf6_interface));
-  else
+  if (!oi)
     {
       zlog_err ("Can't malloc ospf6_interface for ifindex %d", ifp->ifindex);
       return (struct ospf6_interface *) NULL;