include: mtd: Remove duplicate newlines

Drop all duplicate newlines. No functional change.

Signed-off-by: Marek Vasut <marek.vasut+renesas@mailbox.org>
diff --git a/include/mtd/ubi-user.h b/include/mtd/ubi-user.h
index 8d472cc..cc95fa2 100644
--- a/include/mtd/ubi-user.h
+++ b/include/mtd/ubi-user.h
@@ -421,7 +421,6 @@
 	__s8  padding[3];
 } __packed;
 
-
 /**
  * struct ubi_set_vol_prop_req - a data structure used to set an UBI volume
  *                               property.