spi: atmel-quadspi: Fix uninitialized res

spi: atmel-quadspi: Fix uninitialized res

The second platform_get_resource_byname() can not be replaced with
devm_platform_ioremap_resource_byname(), because the intermediate "res"
is used to assign for "aq->mmap_size".

Fixes: 3ccea1dedef3 ("spi: atmel-quadspi: Simpify resource lookup")
Signed-off-by: Jinjie Ruan <ruanjinjie@huawei.com>
Acked-by: Hari Prasath Gujulan Elango <hari.prasathge@microchip.com>
Link: https://patch.msgid.link/20240826125913.3434305-2-ruanjinjie@huawei.com
Signed-off-by: Mark Brown <broonie@kernel.org>