BUG_ON() Conversion in fs/hfs/

this changes if() BUG(); constructs to BUG_ON() which is
cleaner, contains unlikely() and can better optimized away.

Signed-off-by: Eric Sesterhenn <snakebyte@gmx.de>
Signed-off-by: Adrian Bunk <bunk@stusta.de>
diff --git a/fs/hfs/btree.c b/fs/hfs/btree.c
index 7bb11ed..d20131c 100644
--- a/fs/hfs/btree.c
+++ b/fs/hfs/btree.c
@@ -36,8 +36,7 @@
 	tree->inode = iget_locked(sb, id);
 	if (!tree->inode)
 		goto free_tree;
-	if (!(tree->inode->i_state & I_NEW))
-		BUG();
+	BUG_ON(!(tree->inode->i_state & I_NEW));
 	{
 	struct hfs_mdb *mdb = HFS_SB(sb)->mdb;
 	HFS_I(tree->inode)->flags = 0;