__clk_determine_rate() may return error. Skip the current step
in case of error.

Fixes: 1a1a36d7 ("clk: at91: clk-generated: make gclk determine audio_pll rate")
Signed-off-by: Claudiu Beznea <claudiu.beznea@microchip.com>
Reviewed-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Link: https://lore.kernel.org/r/1595403506-8209-2-git-send-email-claudiu.beznea@microchip.comSigned-off-by: Stephen Boyd <sboyd@kernel.org>