clk: meson: remove duplicate logic

First thing we check in meson_clk_set_rate_by_id() is current_rate == rate.
There is not need to check it again.

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Acked-by: Neil Armstrong <narmstrong@baylibre.com>
Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
diff --git a/drivers/clk/meson/gxbb.c b/drivers/clk/meson/gxbb.c
index 2cb53fb..abb5337 100644
--- a/drivers/clk/meson/gxbb.c
+++ b/drivers/clk/meson/gxbb.c
@@ -823,10 +823,7 @@
 	case CLKID_MPLL1:
 	case CLKID_MPLL2:
 	case CLKID_CLK81:
-		if (current_rate != rate)
-			return -EINVAL;
-
-		return 0;
+		return -EINVAL;
 	case CLKID_VPU:
 		return meson_clk_set_rate_by_id(clk,
 				meson_mux_get_parent(clk, CLKID_VPU), rate,