fix(#3196): utils.read_file may hold onto fd

Signed-off-by: Natalie Sepruko <[email protected]>

Author: sepruko

lua/nvim-tree/utils.lua

@@ -26,6 +26,7 @@ function M.read_file(path)
   end
   local stat = vim.loop.fs_fstat(fd)
   if not stat then
+    vim.loop.fs_close(fd)
     return ""
   end
   local data = vim.loop.fs_read(fd, stat.size, 0)