mtd: gpmi: remove the unnecessary pr_err()
The error messages for the failure of dmaengine_prep_slave_sg are not necessary, this patch removes all these pr_err, and returns with the proper error code -EINVAL, not -1. Signed-off-by: Huang Shijie <b32955@freescale.com> Signed-off-by: Brian Norris <computersforpeace@gmail.com>
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