clk: rockchip: don't return NULL when registering inverter fails

Avoid return NULL if rockchip_clk_register_inverter fails, otherwise
rockchip_clk_register_branches print "unknown clock type". The acutal
case is that it's a known clock type but we fail to regiser it, which
may makes user confuse the reason of failure.

Signed-off-by: Shawn Lin <[e-mail]>
Signed-off-by: Heiko Stuebner <[e-mail]>

drivers/clk/rockchip/clk-inverter.c

···
 
 	inv_clock = kmalloc(sizeof(*inv_clock), GFP_KERNEL);
 	if (!inv_clock)
-		return NULL;
+		return ERR_PTR(-ENOMEM);
 
 	init.name = name;
 	init.num_parents = num_parents;
···
 
 	clk = clk_register(NULL, &inv_clock->hw);
 	if (IS_ERR(clk))
-		goto err_free;
+		kfree(inv_clock);
 
 	return clk;
-
-err_free:
-	kfree(inv_clock);
-	return NULL;
 }