befs: remove trailing whitespaces

Removing all trailing whitespaces in befs.

I was skeptic about tainting the history with this, but whitespace changes
can be ignored by using 'git blame -w' and 'git log -w'.

Signed-off-by: Luis de Bethencourt <luisbg@osg.samsung.com>

fs/befs/btree.h

@@ -1,6 +1,6 @@
 /*
  * btree.h
- * 
+ *
  */
 
 int befs_btree_find(struct super_block *sb, const befs_data_stream *ds,