UBIFS: remove Kconfig debugging option

Have the debugging stuff always compiled-in instead. It simplifies maintanance
a lot.

Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
diff --git a/fs/ubifs/lprops.c b/fs/ubifs/lprops.c
index 0cf7a18..86eb8e5 100644
--- a/fs/ubifs/lprops.c
+++ b/fs/ubifs/lprops.c
@@ -846,7 +846,9 @@
 	return lprops;
 }
 
-#ifdef CONFIG_UBIFS_FS_DEBUG
+/*
+ * Everything below is related to debugging.
+ */
 
 /**
  * dbg_check_cats - check category heaps and lists.
@@ -1315,5 +1317,3 @@
 out:
 	return err;
 }
-
-#endif /* CONFIG_UBIFS_FS_DEBUG */