UBIFS: amend debugging name check function prototype

Add 'struct ubifs_info *c' parameter to the 'dbg_check_name()' debugging
function - it will be needed in one of the following commits where we switch to
debugfs. So this is just a preparation.

Mark parameters as 'const' while on it.

Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>

fs/ubifs/dir.c

diff --git a/fs/ubifs/dir.c b/fs/ubifs/dir.c
index c6cbdd0..d1725a9 100644
--- a/fs/ubifs/dir.c
+++ b/fs/ubifs/dir.c
@@ -172,7 +172,9 @@
 
 #ifdef CONFIG_UBIFS_FS_DEBUG
 
-static int dbg_check_name(struct ubifs_dent_node *dent, struct qstr *nm)
+static int dbg_check_name(const struct ubifs_info *c,
+			  const struct ubifs_dent_node *dent,
+			  const struct qstr *nm)
 {
 	if (!(ubifs_chk_flags & UBIFS_CHK_GEN))
 		return 0;
@@ -185,7 +187,7 @@
 
 #else
 
-#define dbg_check_name(dent, nm) 0
+#define dbg_check_name(c, dent, nm) 0
 
 #endif
 
@@ -219,7 +221,7 @@
 		goto out;
 	}
 
-	if (dbg_check_name(dent, &dentry->d_name)) {
+	if (dbg_check_name(c, dent, &dentry->d_name)) {
 		err = -EINVAL;
 		goto out;
 	}