[MTD] [NAND] Work around false compiler warning in CAFÉ driver

drivers/mtd/nand/cafe.c: In function 'cafe_nand_cmdfunc':
drivers/mtd/nand/cafe.c:269: warning: 'irqs' may be used uninitialized in this function
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: David Woodhouse <dwmw2@infradead.org>

drivers/mtd/nand/cafe.c

@@ -265,10 +265,10 @@ static void cafe_nand_cmdfunc(struct mtd_info *mtd, unsigned command,
 	ndelay(100);
 
 	if (1) {
-		int c = 500000;
+		int c;
 		uint32_t irqs;
 
-		while (c--) {
+		for (c = 500000; c != 0; c--) {
 			irqs = cafe_readl(cafe, NAND_IRQ);
 			if (irqs & doneint)
 				break;