[cleanup] Convert XMALLOC/memset to XCALLOC

Simple conversion of XMALLOC/memset to XCALLOC
diff --git a/ripd/rip_peer.c b/ripd/rip_peer.c
index e061789..fd912eb 100644
--- a/ripd/rip_peer.c
+++ b/ripd/rip_peer.c
@@ -36,11 +36,7 @@
 static struct rip_peer *
 rip_peer_new (void)
 {
-  struct rip_peer *new;
-
-  new = XMALLOC (MTYPE_RIP_PEER, sizeof (struct rip_peer));
-  memset (new, 0, sizeof (struct rip_peer));
-  return new;
+  return XCALLOC (MTYPE_RIP_PEER, sizeof (struct rip_peer));
 }
 
 static void