UBI: fix minor stylistic issues

Fix checkpatch.pl errors and warnings:

* space before tab
* line over 80 characters
* include linux/ioctl.h instead of asm/ioctl.h

Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
diff --git a/include/mtd/ubi-user.h b/include/mtd/ubi-user.h
index a390342..3c41097 100644
--- a/include/mtd/ubi-user.h
+++ b/include/mtd/ubi-user.h
@@ -406,9 +406,9 @@
  * @value: value to set
  */
 struct ubi_set_vol_prop_req {
-       __u8  property;
-       __u8  padding[7];
-       __u64 value;
+	__u8  property;
+	__u8  padding[7];
+	__u64 value;
 }  __packed;
 
 #endif /* __UBI_USER_H__ */