UBIFS: lessen amount of debugging check types

We have too many different debugging checks - lessen the amount by merging all
index-related checks into one. At the same time, move the "force in-the-gap"
test to the "index checks" class, because it is too heavy for the "general"
class.

This patch merges TNC, Old index, and Index size check and calles this just
"index checks".

Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
diff --git a/fs/ubifs/tnc_commit.c b/fs/ubifs/tnc_commit.c
index 8959c72..4c15f07 100644
--- a/fs/ubifs/tnc_commit.c
+++ b/fs/ubifs/tnc_commit.c
@@ -22,8 +22,8 @@
 
 /* This file implements TNC functions for committing */
 
-#include "ubifs.h"
 #include <linux/random.h>
+#include "ubifs.h"
 
 /**
  * make_idx_node - make an index node for fill-the-gaps method of TNC commit.
@@ -382,7 +382,7 @@
 				c->gap_lebs = NULL;
 				return err;
 			}
-			if (!dbg_is_chk_gen(c)) {
+			if (!dbg_is_chk_index(c)) {
 				/*
 				 * Do not print scary warnings if the debugging
 				 * option which forces in-the-gaps is enabled.
@@ -690,7 +690,7 @@
 		c->ilebs[c->ileb_cnt++] = lnum;
 		dbg_cmt("LEB %d", lnum);
 	}
-	if (dbg_is_chk_gen(c) && !(random32() & 7))
+	if (dbg_is_chk_index(c) && !(random32() & 7))
 		return -ENOSPC;
 	return 0;
 }