[cleanup] Convert XMALLOC/memset to XCALLOC

Simple conversion of XMALLOC/memset to XCALLOC
diff --git a/ripngd/ripng_peer.c b/ripngd/ripng_peer.c
index 1e58bb8..c04456b 100644
--- a/ripngd/ripng_peer.c
+++ b/ripngd/ripng_peer.c
@@ -42,11 +42,7 @@
 static struct ripng_peer *
 ripng_peer_new (void)
 {
-  struct ripng_peer *new;
-
-  new = XMALLOC (MTYPE_RIPNG_PEER, sizeof (struct ripng_peer));
-  memset (new, 0, sizeof (struct ripng_peer));
-  return new;
+  return XCALLOC (MTYPE_RIPNG_PEER, sizeof (struct ripng_peer));
 }
 
 static void