treewide: Fix comment and string typo 'bufer'

Signed-off-by: Paul Bolle <pebolle@tiscali.nl>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
diff --git a/fs/jbd2/checkpoint.c b/fs/jbd2/checkpoint.c
index 16a698b..d49d202 100644
--- a/fs/jbd2/checkpoint.c
+++ b/fs/jbd2/checkpoint.c
@@ -565,7 +565,7 @@
  *
  * Called with the journal locked.
  * Called with j_list_lock held.
- * Returns number of bufers reaped (for debug)
+ * Returns number of buffers reaped (for debug)
  */
 
 static int journal_clean_one_cp_list(struct journal_head *jh, int *released)