clk: mxs: Use clamp() in clk_ref_round_rate() and clk_ref_set_rate()

Use clamp() instead of duplicating its implementation.
Signed-off-by: Thorsten Blum <thorsten.blum@toblux.com>
Link: https://lore.kernel.org/r/20240710143309.706135-2-thorsten.blum@toblux.comSigned-off-by: Stephen Boyd <sboyd@kernel.org>

drivers/clk/mxs/clk-ref.c

@@ -66,12 +66,7 @@ static long clk_ref_round_rate(struct clk_hw *hw, unsigned long rate,
 
 	tmp = tmp * 18 + rate / 2;
 	do_div(tmp, rate);
-	frac = tmp;
-
-	if (frac < 18)
-		frac = 18;
-	else if (frac > 35)
-		frac = 35;
+	frac = clamp(tmp, 18, 35);
 
 	tmp = parent_rate;
 	tmp *= 18;
@@ -91,12 +86,7 @@ static int clk_ref_set_rate(struct clk_hw *hw, unsigned long rate,
 
 	tmp = tmp * 18 + rate / 2;
 	do_div(tmp, rate);
-	frac = tmp;
-
-	if (frac < 18)
-		frac = 18;
-	else if (frac > 35)
-		frac = 35;
+	frac = clamp(tmp, 18, 35);
 
 	spin_lock_irqsave(&mxs_lock, flags);