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/lprops.c b/fs/ubifs/lprops.c
index b5c95a6..2e4bc27f 100644
--- a/fs/ubifs/lprops.c
+++ b/fs/ubifs/lprops.c
@@ -1001,7 +1001,7 @@
 out:
 	if (err) {
 		dbg_msg("failed cat %d hpos %d err %d", cat, i, err);
-		dbg_dump_stack();
+		dump_stack();
 		dbg_dump_heap(c, heap, cat);
 	}
 }