new helper: file_inode(file)

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/fs/binfmt_flat.c b/fs/binfmt_flat.c
index b563719..2036d21 100644
--- a/fs/binfmt_flat.c
+++ b/fs/binfmt_flat.c
@@ -438,7 +438,7 @@
 	int ret;
 
 	hdr = ((struct flat_hdr *) bprm->buf);		/* exec-header */
-	inode = bprm->file->f_path.dentry->d_inode;
+	inode = file_inode(bprm->file);
 
 	text_len  = ntohl(hdr->data_start);
 	data_len  = ntohl(hdr->data_end) - ntohl(hdr->data_start);