ubifs: Fix kernel-doc

Fix function name in fs/ubifs/io.c kernel-doc comment
to remove some warnings found by clang(make W=1 LLVM=1).

fs/ubifs/io.c:497: warning: expecting prototype for
wbuf_timer_callback(). Prototype was for wbuf_timer_callback_nolock()
instead
fs/ubifs/io.c:513: warning: expecting prototype for new_wbuf_timer().
Prototype was for new_wbuf_timer_nolock() instead
fs/ubifs/io.c:538: warning: expecting prototype for cancel_wbuf_timer().
Prototype was for cancel_wbuf_timer_nolock() instead
Reported-by: Abaci Robot <abaci@linux.alibaba.com>
Signed-off-by: Yang Li <yang.lee@linux.alibaba.com>
Signed-off-by: Richard Weinberger <richard@nod.at>

fs/ubifs/io.c

@@ -488,7 +488,7 @@ void ubifs_prep_grp_node(struct ubifs_info *c, void *node, int len, int last)
 }
 
 /**
- * wbuf_timer_callback - write-buffer timer callback function.
+ * wbuf_timer_callback_nolock - write-buffer timer callback function.
  * @timer: timer data (write-buffer descriptor)
  *
  * This function is called when the write-buffer timer expires.
@@ -505,7 +505,7 @@ static enum hrtimer_restart wbuf_timer_callback_nolock(struct hrtimer *timer)
 }
 
 /**
- * new_wbuf_timer - start new write-buffer timer.
+ * new_wbuf_timer_nolock - start new write-buffer timer.
  * @c: UBIFS file-system description object
  * @wbuf: write-buffer descriptor
  */
@@ -531,7 +531,7 @@ static void new_wbuf_timer_nolock(struct ubifs_info *c, struct ubifs_wbuf *wbuf)
 }
 
 /**
- * cancel_wbuf_timer - cancel write-buffer timer.
+ * cancel_wbuf_timer_nolock - cancel write-buffer timer.
  * @wbuf: write-buffer descriptor
  */
 static void cancel_wbuf_timer_nolock(struct ubifs_wbuf *wbuf)