UBIFS: get rid of dbg_dump_stack

In case of errors we almost always need the stack dump - it makes no sense
to compile it out. Remove the 'dbg_dump_stack()' function completely.

Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
diff --git a/fs/ubifs/journal.c b/fs/ubifs/journal.c
index bc75e9d..bad8b5f 100644
--- a/fs/ubifs/journal.c
+++ b/fs/ubifs/journal.c
@@ -385,7 +385,7 @@
 	if (err == -ENOSPC) {
 		/* This are some budgeting problems, print useful information */
 		down_write(&c->commit_sem);
-		dbg_dump_stack();
+		dump_stack();
 		dbg_dump_budg(c, &c->bi);
 		dbg_dump_lprops(c);
 		cmt_retries = dbg_check_lprops(c);