nandbcb: Fix uninitialized variable

Fix Coverity Issue 9006654. In write_fcb, use of an uninitialized
variable "ret".

Signed-off-by: Ye Li <ye.li@nxp.com>
Reviewed-by: Peng Fan <peng.fan@nxp.com>
Signed-off-by: Peng Fan <peng.fan@nxp.com>
diff --git a/arch/arm/mach-imx/cmd_nandbcb.c b/arch/arm/mach-imx/cmd_nandbcb.c
index 44fc376..c01f6ae 100644
--- a/arch/arm/mach-imx/cmd_nandbcb.c
+++ b/arch/arm/mach-imx/cmd_nandbcb.c
@@ -563,7 +563,7 @@
 {
 	struct mtd_info *mtd;
 	void *fcb_raw_page = NULL;
-	int i, ret;
+	int i, ret = 0;
 	loff_t off;
 	size_t size;