zephyr/main: Move var declarations to the top of file.

ports/zephyr/main.c

@@ -4,7 +4,7 @@
  * The MIT License (MIT)
  *
  * Copyright (c) 2013, 2014 Damien P. George
- * Copyright (c) 2016 Linaro Limited
+ * Copyright (c) 2016-2017 Linaro Limited
  *
  * Permission is hereby granted, free of charge, to any person obtaining a copy
  * of this software and associated documentation files (the "Software"), to deal
@@ -41,6 +41,9 @@
 #include "lib/utils/pyexec.h"
 #include "lib/mp-readline/readline.h"
 
+static char *stack_top;
+static char heap[MICROPY_HEAP_SIZE];
+
 void do_str(const char *src, mp_parse_input_kind_t input_kind) {
     nlr_buf_t nlr;
     if (nlr_push(&nlr) == 0) {
@@ -56,9 +59,6 @@ void do_str(const char *src, mp_parse_input_kind_t input_kind) {
     }
 }
 
-static char *stack_top;
-static char heap[MICROPY_HEAP_SIZE];
-
 void init_zephyr(void) {
     // We now rely on CONFIG_NET_APP_SETTINGS to set up bootstrap
     // network addresses.