scsi: ufs: core: Fix the return value documentation

ufshcd_wait_for_dev_cmd() and all its callers can return an OCS error.
OCS errors are represented by positive integers. Remove the WARN_ONCE()
statements that complain about positive error codes and update the
documentation.

Keep the behavior of ufshcd_wait_for_dev_cmd() because this return value
may end be passed as the second argument of bsg_job_done() and
bsg_job_done() handles positive and negative error codes differently.

Cc: Peter Wang <[email protected]>
Fixes: cc59f3b68542 ("scsi: ufs: core: Improve return value documentation")
Signed-off-by: Bart Van Assche <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Reviewed-by: Peter Wang <[email protected]>
Signed-off-by: Martin K. Petersen <[email protected]>

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