[cleanup] Convert XMALLOC/memset to XCALLOC

Simple conversion of XMALLOC/memset to XCALLOC
diff --git a/lib/if.c b/lib/if.c
index db590f5..de3f641 100644
--- a/lib/if.c
+++ b/lib/if.c
@@ -620,9 +620,7 @@
 struct connected *
 connected_new (void)
 {
-  struct connected *new = XMALLOC (MTYPE_CONNECTED, sizeof (struct connected));
-  memset (new, 0, sizeof (struct connected));
-  return new;
+  return XCALLOC (MTYPE_CONNECTED, sizeof (struct connected));
 }
 
 /* Free connected structure. */