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/drivers/mtd/ubi/scan.c b/drivers/mtd/ubi/scan.c
index d2d12ab..2135a53 100644
--- a/drivers/mtd/ubi/scan.c
+++ b/drivers/mtd/ubi/scan.c
@@ -1103,7 +1103,7 @@
 		 * otherwise, only print a warning.
 		 */
 		if (si->corr_peb_count >= max_corr) {
-			ubi_err("too many corrupted PEBs, refusing this device");
+			ubi_err("too many corrupted PEBs, refusing");
 			return -EINVAL;
 		}
 	}