GFS2: Clear gl_object if gfs2_create_inode fails

If function gfs2_create_inode fails after the inode has been
created (for example, if the inode_refresh fails for some reason)
the function was setting gl_object but never clearing it again.
The glocks are left pointing to a freed inode. This patch adds
the calls to clear gl_object in the appropriate error paths.
Signed-off-by: Bob Peterson <rpeterso@redhat.com>
Reviewed-by: Andreas Gruenbacher <agruenba@redhat.com>

fs/gfs2/inode.c

@@ -775,14 +775,17 @@ static int gfs2_create_inode(struct inode *dir, struct dentry *dentry,
 	return error;
 
 fail_gunlock3:
+	glock_clear_object(io_gl, ip);
 	gfs2_glock_dq_uninit(&ip->i_iopen_gh);
 	gfs2_glock_put(io_gl);
 fail_gunlock2:
 	if (io_gl)
 		clear_bit(GLF_INODE_CREATING, &io_gl->gl_flags);
 fail_free_inode:
-	if (ip->i_gl)
+	if (ip->i_gl) {
+		glock_clear_object(ip->i_gl, ip);
 		gfs2_glock_put(ip->i_gl);
+	}
 	gfs2_rsqa_delete(ip, NULL);
 fail_free_acls:
 	if (default_acl)