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f8cf3ceb0b
INT 13 calls return a status value via %ah, with CF set if %ah is non-zero (indicating an error). Our wrappers zero the whole of %ax if CF is clear, to allow C code (which has no easy access to CF) to simply test for a non-zero status to detect an error. The current code assigns the returned status to a uint8_t, effectively testing %al rather than %ah. Fix by treating the returned status as a uint16_t instead. Signed-off-by: Michael Brown <mcb30@ipxe.org>
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