clk: zynqmp: pll: Remove some dead code

clk: zynqmp: pll: Remove some dead code

'clk_hw_set_rate_range()' does not return any error code and 'ret' is
known to be 0 at this point, so this message can never be displayed.

Remove it.

Fixes: 3fde0e16d016 ("drivers: clk: Add ZynqMP clock driver")
Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Link: https://lore.kernel.org/r/71a9fed5f762a71248b8ac73c0a15af82f3ce1e2.1619867987.git.christophe.jaillet@wanadoo.fr
Reviewed-by: Michael Tretter <m.tretter@pengutronix.de>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>