sgx: use ->f_mapping...

Reviewed-by: Jarkko Sakkinen <jarkko@kernel.org>
Reviewed-by: Christian Brauner (Microsoft) <brauner@kernel.org>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

arch/x86/kernel/cpu/sgx/encl.c

@@ -906,8 +906,7 @@ const cpumask_t *sgx_encl_cpumask(struct sgx_encl *encl)
 static struct page *sgx_encl_get_backing_page(struct sgx_encl *encl,
 					      pgoff_t index)
 {
-	struct inode *inode = encl->backing->f_path.dentry->d_inode;
-	struct address_space *mapping = inode->i_mapping;
+	struct address_space *mapping = encl->backing->f_mapping;
 	gfp_t gfpmask = mapping_gfp_mask(mapping);
 
 	return shmem_read_mapping_page_gfp(mapping, index, gfpmask);