fix compilation

Author: Andronik Ordian

src/lib.rs

@@ -94,15 +94,15 @@ unsafe impl GlobalAlloc for MiMalloc {
 
  #[inline]
  unsafe fn dealloc(&self, ptr: *mut u8, _layout: Layout) {
- mi_free(ptr as *const c_void);
+ mi_free(ptr as *mut c_void);
  }
 
  #[inline]
  unsafe fn realloc(&self, ptr: *mut u8, layout: Layout, new_size: usize) -> *mut u8 {
  if layout.align() <= MIN_ALIGN && layout.align() <= layout.size() {
- mi_realloc(ptr as *const c_void, new_size) as *mut u8
+ mi_realloc(ptr as *mut c_void, new_size) as *mut u8
  } else {
- mi_realloc_aligned(ptr as *const c_void, new_size, layout.align()) as *mut u8
+ mi_realloc_aligned(ptr as *mut c_void, new_size, layout.align()) as *mut u8
  }
  }
 }