mtd: use __packed shorthand

Signed-off-by: Brian Norris <computersforpeace@gmail.com>
diff --git a/drivers/mtd/mtdswap.c b/drivers/mtd/mtdswap.c
index 48cf6f9..fc8b3d1 100644
--- a/drivers/mtd/mtdswap.c
+++ b/drivers/mtd/mtdswap.c
@@ -145,7 +145,7 @@
 struct mtdswap_oobdata {
 	__le16 magic;
 	__le32 count;
-} __attribute__((packed));
+} __packed;
 
 #define MTDSWAP_MAGIC_CLEAN	0x2095
 #define MTDSWAP_MAGIC_DIRTY	(MTDSWAP_MAGIC_CLEAN + 1)