[MTD] [NAND] Remove unused variable in plat_nand_remove

With CONFIG_MTD_PARTITIONS not set, got this:
drivers/mtd/nand/plat_nand.c:113: warning: unused variable 'pdata'
Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
Signed-off-by: David Woodhouse <dwmw2@infradead.org>

drivers/mtd/nand/plat_nand.c

@@ -110,7 +110,9 @@ out:
 static int __devexit plat_nand_remove(struct platform_device *pdev)
 {
 	struct plat_nand_data *data = platform_get_drvdata(pdev);
+#ifdef CONFIG_MTD_PARTITIONS
 	struct platform_nand_data *pdata = pdev->dev.platform_data;
+#endif
 
 	nand_release(&data->mtd);
 #ifdef CONFIG_MTD_PARTITIONS