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As other exported fifo functions, we should check whether the fifo is valid in sbi_fifo_is_empty and sbi_fifo_is_full. To this end, this patch changes the retval from bool to int, and the two functions will return SBI_EINVAL in the case the fifo is invalid. Signed-off-by: Dong Du <Dd_nirvana@sjtu.edu.cn> Reviewed-by: Atish Patra <atish.patra@wdc.com>