UBIFS: improve function-level documentation

Fix various inconsistencies in the documentation associated with various
functions.

In the case of fs/ubifs/lprops.c, the second parameter of
ubifs_get_lp_stats was renamed from st to lst in commit 84abf972cc
("UBIFS: add re-mount debugging checks")

In the case of fs/ubifs/lpt_commit.c, the excess variables have never
existed in the associated functions since the code was introduced into the
kernel.

The others appear to be straightforward typos.

Issues detected using Coccinelle (http://coccinelle.lip6.fr/)

Signed-off-by: Julia Lawall <Julia.Lawall@lip6.fr>
Signed-off-by: Richard Weinberger <richard@nod.at>

fs/ubifs/lpt_commit.c

@@ -34,7 +34,6 @@ static int dbg_populate_lsave(struct ubifs_info *c);
 
 /**
  * first_dirty_cnode - find first dirty cnode.
- * @c: UBIFS file-system description object
  * @nnode: nnode at which to start
  *
  * This function returns the first dirty cnode or %NULL if there is not one.
@@ -1623,7 +1622,6 @@ static int dbg_is_node_dirty(struct ubifs_info *c, int node_type, int lnum,
  * dbg_check_ltab_lnum - check the ltab for a LPT LEB number.
  * @c: the UBIFS file-system description object
  * @lnum: LEB number where node was written
- * @offs: offset where node was written
  *
  * This function returns %0 on success and a negative error code on failure.
  */
@@ -1870,7 +1868,7 @@ int dbg_chk_lpt_sz(struct ubifs_info *c, int action, int len)
 }
 
 /**
- * ubifs_dump_lpt_leb - dump an LPT LEB.
+ * dump_lpt_leb - dump an LPT LEB.
  * @c: UBIFS file-system description object
  * @lnum: LEB number to dump
  *