mtd: sharpslpart: make local function sharpsl_nand_cleanup_ftl() static

Fixes the following sparse warnings:

drivers/mtd/parsers/sharpslpart.c:222:6: warning:
 symbol 'sharpsl_nand_cleanup_ftl' was not declared. Should it be static?
Signed-off-by: NWei Yongjun <weiyongjun1@huawei.com>
Acked-by: NAndrea Adami <andrea.adami@gmail.com>
Signed-off-by: NBoris Brezillon <boris.brezillon@free-electrons.com>

drivers/mtd/parsers/sharpslpart.c

@@ -219,7 +219,7 @@ static int sharpsl_nand_init_ftl(struct mtd_info *mtd, struct sharpsl_ftl *ftl)
 	return ret;
 }
 
-void sharpsl_nand_cleanup_ftl(struct sharpsl_ftl *ftl)
+static void sharpsl_nand_cleanup_ftl(struct sharpsl_ftl *ftl)
 {
 	kfree(ftl->log2phy);
 }