[cleanup] Convert XMALLOC/memset to XCALLOC

Simple conversion of XMALLOC/memset to XCALLOC
diff --git a/ripd/rip_offset.c b/ripd/rip_offset.c
index e7d71f6..0155f90 100644
--- a/ripd/rip_offset.c
+++ b/ripd/rip_offset.c
@@ -63,11 +63,7 @@
 static struct rip_offset_list *
 rip_offset_list_new (void)
 {
-  struct rip_offset_list *new;
-
-  new = XMALLOC (MTYPE_RIP_OFFSET_LIST, sizeof (struct rip_offset_list));
-  memset (new, 0, sizeof (struct rip_offset_list));
-  return new;
+  return XCALLOC (MTYPE_RIP_OFFSET_LIST, sizeof (struct rip_offset_list));
 }
 
 static void