staging:iio:lpc32xx_adc: Use resource_size instead of opencoding it
staging:iio:lpc32xx_adc: Use resource_size instead of opencoding it

Fixes the following error from coccicheck:
	drivers/staging/iio/adc/lpc32xx_adc.c:153:43-46: ERROR: Missing resource_size with res

Signed-off-by: Lars-Peter Clausen <3318dc5ce3e4fb7c28a0b841b6801c884e1d0896@metafoo.de>
Acked-by: Roland Stigge <46ef883ee29e711e29b1a68d4ada6c2ebfaacc1f@antcom.de>
Signed-off-by: Jonathan Cameron <09f65b71b7655725897b2fd41a09a0cefe2e1ace@kernel.org>

KristFoundation/Programs,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas