ide-cd: factor out transfer size checking from cdrom_read_intr()
ide-cd: factor out transfer size checking from cdrom_read_intr()

This is a preparation for cdrom_read_intr() and cdrom_write_intr() merge.

Signed-off-by: Bartlomiej Zolnierkiewicz <248de9df611a028e5eceb9d893a2ed6c24c89ef4@gmail.com>

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