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/linux/mtd/ubi.h b/include/linux/mtd/ubi.h
index 84854ed..15da0e9 100644
--- a/include/linux/mtd/ubi.h
+++ b/include/linux/mtd/ubi.h
@@ -21,7 +21,7 @@
 #ifndef __LINUX_UBI_H__
 #define __LINUX_UBI_H__
 
-#include <asm/ioctl.h>
+#include <linux/ioctl.h>
 #include <linux/types.h>
 #include <mtd/ubi-user.h>
 
@@ -87,7 +87,7 @@
  * physical eraseblock size and on how much bytes UBI headers consume. But
  * because of the volume alignment (@alignment), the usable size of logical
  * eraseblocks if a volume may be less. The following equation is true:
- * 	@usable_leb_size = LEB size - (LEB size mod @alignment),
+ *	@usable_leb_size = LEB size - (LEB size mod @alignment),
  * where LEB size is the logical eraseblock size defined by the UBI device.
  *
  * The alignment is multiple to the minimal flash input/output unit size or %1