disk: Use a helper function to reduce duplication
Reduce the duplicated code slightly by using a helper function to handle
the common code.
This reduces the code size very slightly.
Signed-off-by: 
Simon Glass <sjg@chromium.org>
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Reduce the duplicated code slightly by using a helper function to handle
the common code.
This reduces the code size very slightly.
Signed-off-by: Simon Glass <sjg@chromium.org>