clk: ingenic/TCU: Fix round_rate returning error

When requesting a rate superior to the parent's rate, it would return
-EINVAL instead of simply returning the parent's rate like it should.

Fixes: 4f89e4b8 ("clk: ingenic: Add driver for the TCU clocks")
Cc: stable@vger.kernel.org
Signed-off-by: Paul Cercueil <paul@crapouillou.net>
Link: https://lkml.kernel.org/r/20200213161952.37460-2-paul@crapouillou.netSigned-off-by: Stephen Boyd <sboyd@kernel.org>

drivers/clk/ingenic/tcu.c

@@ -189,7 +189,7 @@ static long ingenic_tcu_round_rate(struct clk_hw *hw, unsigned long req_rate,
 	u8 prescale;
 
 	if (req_rate > rate)
-		return -EINVAL;
+		return rate;
 
 	prescale = ingenic_tcu_get_prescale(rate, req_rate);