cbfs: Change file_cbfs_find_uncached() to return an error
This function currently returns a node pointer so there is no way to know the error code. Also it uses data in BSS which seems unnecessary since the caller might prefer to use a local variable. Update the function and split its body out into a separate function so we can use it later. Signed-off-by: NSimon Glass <sjg@chromium.org> Reviewed-by: NBin Meng <bmeng.cn@gmail.com>
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