include: zfs: Remove duplicate newlines

Drop all duplicate newlines. No functional change.

Signed-off-by: Marek Vasut <marek.vasut+renesas@mailbox.org>
diff --git a/include/zfs/spa.h b/include/zfs/spa.h
index cd2ddf5..df01d49 100644
--- a/include/zfs/spa.h
+++ b/include/zfs/spa.h
@@ -10,7 +10,6 @@
 #ifndef ZFS_SPA_HEADER
 #define	ZFS_SPA_HEADER 1
 
-
 /*
  * General-purpose 32-bit and 64-bit bitfield encodings.
  */
diff --git a/include/zfs/zfs.h b/include/zfs/zfs.h
index 72d8745..8415437 100644
--- a/include/zfs/zfs.h
+++ b/include/zfs/zfs.h
@@ -10,7 +10,6 @@
 #ifndef	GRUB_ZFS_HEADER
 #define	GRUB_ZFS_HEADER 1
 
-
 /*
  * On-disk version number.
  */
diff --git a/include/zfs/zfs_acl.h b/include/zfs/zfs_acl.h
index d6cc408..038c68f 100644
--- a/include/zfs/zfs_acl.h
+++ b/include/zfs/zfs_acl.h
@@ -38,5 +38,4 @@
 	uint8_t	z_ace_data[ZFS_ACE_SPACE]; /* space for embedded ACEs */
 } zfs_znode_acl_t;
 
-
 #endif	/* _SYS_FS_ZFS_ACL_H */