devm_request_and_ioremap will already print a error messages on it's own if something goes wrong. So strictly speaking this one is redundant, but I don't think it is necessary to do a resend just for this, maybe you can remove the extra dev_err when you apply the patch.
Thanks for pointing that out. I will get rid of the messages in the future. That seems easier than figuring out how to adapt the message to the new function.
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