rtc: remove unnecessary error message after platform_get_irq

rtc: remove unnecessary error message after platform_get_irq

The function “platform_get_irq” can log an error already.
Thus omit redundant messages for the exception handling in the
calling functions.

This issue was detected by using the Coccinelle software.

Signed-off-by: Markus Elfring <elfring@users.sourceforge.net>
Acked-by: Vladimir Zapolskiy <vz@mleia.com>
Link: https://lore.kernel.org/r/04116352-b464-041c-1939-96440133aa6f@web.de
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>