omap: iovmm: s/sg_dma_len(sg)/sg->length/
omap: iovmm: s/sg_dma_len(sg)/sg->length/

iovmm is erroneously using sg_dma_len with unmapped (DMA API-wise)
SG entries, and will break if CONFIG_NEED_SG_DMA_LENGTH is enabled.

Fix that by using sg->length instead.

Reported-by: Russell King <ba324ca7b1c77fc20bb970d5aff6eea9377918a5@arm.linux.org.uk>
Tested-by: Laurent Pinchart <3ded2f39a78f0d7044839546f95841842b4d7c96@ideasonboard.com>
Signed-off-by: Ohad Ben-Cohen <f42ebdd520afb7505b40286b1d13fbb7281e5b96@wizery.com>

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