Update src/lib.rs

Co-authored-by: Soso <[email protected]>

Author: JalonWong

src/lib.rs

@@ -52,12 +52,12 @@ use critical_section::Mutex;
 macro_rules! init {
     ($heap:ident, $size:expr) => {
         // Ensure it is called only once.
-        embedded_alloc::call_once();
+        $crate::call_once();
         // Ensure the heap is static.
         let _static_heap: &'static Heap = &$heap;
         assert!($size > 0);
-        static mut HEAP_MEM: [core::mem::MaybeUninit<u8>; $size] =
-            [core::mem::MaybeUninit::uninit(); $size];
+        static mut HEAP_MEM: [::core::mem::MaybeUninit<u8>; $size] =
+            [::core::mem::MaybeUninit::uninit(); $size];
         unsafe {
             #[allow(static_mut_refs)]
             $heap.init(&raw mut HEAP_MEM as usize, $size)