mtd: atmel_nand: fix wrong use of 0 as NULL
mtd: atmel_nand: fix wrong use of 0 as NULL

Fixing this error:
atmel_nand.c:718:20: warning: Using plain integer as NULL pointer

Signed-off-by: Nicolas Ferre <45b517be0e5ec6dc3a39715767c1d18e090d39b4@atmel.com>
Acked-by: Jean-Christophe PLAGNIOL-VILLARD <9fc55922e47e21cb004bb878f69efa10ab51cf02@jcrosoft.com>
Signed-off-by: Artem Bityutskiy <47df67c0fd8cbe8b1012edad99e6694575a29d40@gmail.com>

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