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semihosting: Adjust error checking in common_semi_cb
The err parameter is non-zero if and only if an error occured. Use this instead of ret == -1 for determining if we need to update the saved errno. This fixes the errno setting of SYS_ISTTY, which returns 0 on error, not -1. Reviewed-by: Alex Bennée <alex.bennee@linaro.org> Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
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