new helper: file_inode(file)

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/fs/proc/nommu.c b/fs/proc/nommu.c
index b1822dd..ccfd99b 100644
--- a/fs/proc/nommu.c
+++ b/fs/proc/nommu.c
@@ -45,7 +45,7 @@
 	file = region->vm_file;
 
 	if (file) {
-		struct inode *inode = region->vm_file->f_path.dentry->d_inode;
+		struct inode *inode = file_inode(region->vm_file);
 		dev = inode->i_sb->s_dev;
 		ino = inode->i_ino;
 	}