ecryptfs: switch ecryptfs_decode_and_decrypt_filename() from dentry to sb

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/fs/ecryptfs/ecryptfs_kernel.h b/fs/ecryptfs/ecryptfs_kernel.h
index f622a73..df19d34 100644
--- a/fs/ecryptfs/ecryptfs_kernel.h
+++ b/fs/ecryptfs/ecryptfs_kernel.h
@@ -575,7 +575,7 @@
 			     struct inode *ecryptfs_inode);
 int ecryptfs_decode_and_decrypt_filename(char **decrypted_name,
 					 size_t *decrypted_name_size,
-					 struct dentry *ecryptfs_dentry,
+					 struct super_block *sb,
 					 const char *name, size_t name_size);
 int ecryptfs_fill_zeros(struct file *file, loff_t new_length);
 int ecryptfs_encrypt_and_encode_filename(