[cleanup] Convert XMALLOC/memset to XCALLOC

Simple conversion of XMALLOC/memset to XCALLOC
diff --git a/ripd/ripd.c b/ripd/ripd.c
index 2525679..cb2603d 100644
--- a/ripd/ripd.c
+++ b/ripd/ripd.c
@@ -110,13 +110,9 @@
 }
 
 static struct rip_info *
-rip_info_new ()
+rip_info_new (void)
 {
-  struct rip_info *new;
-
-  new = XMALLOC (MTYPE_RIP_INFO, sizeof (struct rip_info));
-  memset (new, 0, sizeof (struct rip_info));
-  return new;
+  return XCALLOC (MTYPE_RIP_INFO, sizeof (struct rip_info));
 }
 
 void
@@ -2697,8 +2693,7 @@
 static int
 rip_create (void)
 {
-  rip = XMALLOC (MTYPE_RIP, sizeof (struct rip));
-  memset (rip, 0, sizeof (struct rip));
+  rip = XCALLOC (MTYPE_RIP, sizeof (struct rip));
 
   /* Set initial value. */
   rip->version_send = RI_RIP_VERSION_2;
@@ -3117,10 +3112,7 @@
 static struct rip_distance *
 rip_distance_new (void)
 {
-  struct rip_distance *new;
-  new = XMALLOC (MTYPE_RIP_DISTANCE, sizeof (struct rip_distance));
-  memset (new, 0, sizeof (struct rip_distance));
-  return new;
+  return XCALLOC (MTYPE_RIP_DISTANCE, sizeof (struct rip_distance));
 }
 
 static void