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b254a8359e
The existing API for these functions is different from the rest of U-Boot, in that any error code must be obtained from the errno variable on failure. This variable is part of the C library, so accessing it outside of the special 'sandbox' shim-functions is not ideal. Adjust the API to return an error code, to avoid this. Update existing uses to check for any negative value, rather than just -1. Signed-off-by: Simon Glass <sjg@chromium.org>