Fix my last commit - break is missing

src/core/pbuf.c

@@ -228,6 +228,7 @@ pbuf_alloc(pbuf_layer layer, u16_t length, pbuf_type type)
   case PBUF_REF: /* fall through */
   case PBUF_ROM:
     p = pbuf_alloc_reference(NULL, length, type);
+    break;
   case PBUF_POOL:
     {
       struct pbuf *q, *last;