kill f_dentry uses

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/security/commoncap.c b/security/commoncap.c
index bab0611..2915d85 100644
--- a/security/commoncap.c
+++ b/security/commoncap.c
@@ -446,7 +446,7 @@
 	if (bprm->file->f_path.mnt->mnt_flags & MNT_NOSUID)
 		return 0;
 
-	dentry = dget(bprm->file->f_dentry);
+	dentry = dget(bprm->file->f_path.dentry);
 
 	rc = get_vfs_caps_from_disk(dentry, &vcaps);
 	if (rc < 0) {