Chore: trim spaces

kernel/lib/mman.c

@@ -154,7 +154,7 @@ uint64_t _allocate_page(size_t req, int idx, uint64_t l, uint64_t r)
     ret = _allocate_page(req, LIDX, l, m);
   if (ret == MMAN_NO_PAGE && RCH->size >= req)
     ret = _allocate_page(req, RIDX, m, r);
-  
+
   _pull(idx, sz);
   return ret;
 }