[PATCH]fix a warning on drivers/mtd/nand/cafe_nand.c

[Zhenwen Xu]

fix this warning:

drivers/mtd/nand/cafe_nand.c: In function ‘cafe_nand_probe’:
drivers/mtd/nand/cafe_nand.c:730: warning: passing argument 2 of ‘request_irq’ from incompatible pointer type