[cleanup] Convert XMALLOC/memset to XCALLOC

Simple conversion of XMALLOC/memset to XCALLOC
diff --git a/ospfd/ospf_neighbor.c b/ospfd/ospf_neighbor.c
index 843e93f..967ca15 100644
--- a/ospfd/ospf_neighbor.c
+++ b/ospfd/ospf_neighbor.c
@@ -69,8 +69,7 @@
   struct ospf_neighbor *nbr;
 
   /* Allcate new neighbor. */
-  nbr = XMALLOC (MTYPE_OSPF_NEIGHBOR, sizeof (struct ospf_neighbor));
-  memset (nbr, 0, sizeof (struct ospf_neighbor));
+  nbr = XCALLOC (MTYPE_OSPF_NEIGHBOR, sizeof (struct ospf_neighbor));
 
   /* Relate neighbor to the interface. */
   nbr->oi = oi;