mtd: maps: physmap: Check mtd_device_{parse_register, unregister}() ret code
mtd_device_parse_register() and mtd_device_unregister() can fail, check their return code and propagate the error to the upper layer if needed. Signed-off-by: Boris Brezillon <boris.brezillon@bootlin.com> Reviewed-by: Ricardo Ribalda Delgado <ricardo.ribalda@gmail.com> Acked-by: Linus Walleij <linus.walleij@linaro.org>
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