new helper: file_inode(file)

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/fs/coredump.c b/fs/coredump.c
index 1774932..69baf90 100644
--- a/fs/coredump.c
+++ b/fs/coredump.c
@@ -411,7 +411,7 @@
 {
 	struct pipe_inode_info *pipe;
 
-	pipe = file->f_path.dentry->d_inode->i_pipe;
+	pipe = file_inode(file)->i_pipe;
 
 	pipe_lock(pipe);
 	pipe->readers++;
@@ -600,7 +600,7 @@
 		if (IS_ERR(cprm.file))
 			goto fail_unlock;
 
-		inode = cprm.file->f_path.dentry->d_inode;
+		inode = file_inode(cprm.file);
 		if (inode->i_nlink > 1)
 			goto close_fail;
 		if (d_unhashed(cprm.file->f_path.dentry))