kfifo: fix kernel-doc notation

Fix kfifo kernel-doc warnings:

Warning(kernel/kfifo.c:361): No description found for parameter 'total'
Warning(kernel/kfifo.c:402): bad line:  @ @lenout: pointer to output variable with copied data
Warning(kernel/kfifo.c:412): No description found for parameter 'lenout'
Signed-off-by: Randy Dunlap <randy.dunlap@oracle.com>
Cc: Stefani Seibold <stefani@seibold.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

kernel/kfifo.c

@@ -349,6 +349,7 @@ EXPORT_SYMBOL(__kfifo_from_user_n);
  * @fifo: the fifo to be used.
  * @from: pointer to the data to be added.
  * @len: the length of the data to be added.
+ * @total: the actual returned data length.
  *
  * This function copies at most @len bytes from the @from into the
  * FIFO depending and returns -EFAULT/0.
@@ -399,7 +400,7 @@ EXPORT_SYMBOL(__kfifo_to_user_n);
  * @fifo: the fifo to be used.
  * @to: where the data must be copied.
  * @len: the size of the destination buffer.
- @ @lenout: pointer to output variable with copied data
+ * @lenout: pointer to output variable with copied data
  *
  * This function copies at most @len bytes from the FIFO into the
  * @to buffer and 0 or -EFAULT.