new helper: file_inode(file)

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/fs/nfs/nfs4file.c b/fs/nfs/nfs4file.c
index 08ddccc..13e6bb3 100644
--- a/fs/nfs/nfs4file.c
+++ b/fs/nfs/nfs4file.c
@@ -94,7 +94,7 @@
 nfs4_file_fsync(struct file *file, loff_t start, loff_t end, int datasync)
 {
 	int ret;
-	struct inode *inode = file->f_path.dentry->d_inode;
+	struct inode *inode = file_inode(file);
 
 	do {
 		ret = filemap_write_and_wait_range(inode->i_mapping, start, end);