rtc: pcf2123: remove useless error path goto

kfree_exit only returns ret, remove it. This also fixes the
devm_regmap_init_spi error case where the probe wouldn't actually fail
because ret is initialized to 0.

Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Link: https://lore.kernel.org/r/20190819182656.29744-6-alexandre.belloni@bootlin.com


Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>