mtd: nandsim: fix free of NULL pointer

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Gitweb:     http://git.infradead.org/?p=mtd-2.6.git;a=commit;h=ec7478fa173f65e5ee5fd2ba42c59ca3e700027b
Commit:     ec7478fa173f65e5ee5fd2ba42c59ca3e700027b
Parent:     83dcf400be7165af938dbd6b8ce6805c754701db
Author:     shengyong <shengyong1 at huawei.com>
AuthorDate: Thu Jun 25 02:23:13 2015 +0000
Committer:  Brian Norris <computersforpeace at gmail.com>
CommitDate: Mon Jul 6 15:20:09 2015 -0700

    mtd: nandsim: fix free of NULL pointer
    
    If allocating ns->nand_pages_slab fails, do not try to destroy it when
    cleaning up nandsim resources.
    
    Signed-off-by: Sheng Yong <shengyong1 at huawei.com>
    Signed-off-by: Brian Norris <computersforpeace at gmail.com>
---
 drivers/mtd/nand/nandsim.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/mtd/nand/nandsim.c b/drivers/mtd/nand/nandsim.c
index 52c0c1a..6a74f62 100644
--- a/drivers/mtd/nand/nandsim.c
+++ b/drivers/mtd/nand/nandsim.c
@@ -649,7 +649,8 @@ static void free_device(struct nandsim *ns)
 				kmem_cache_free(ns->nand_pages_slab,
 						ns->pages[i].byte);
 		}
-		kmem_cache_destroy(ns->nand_pages_slab);
+		if (ns->nand_pages_slab)
+			kmem_cache_destroy(ns->nand_pages_slab);
 		vfree(ns->pages);
 	}
 }