pinctrl: stm32: Fix up errorpath after merge

When merging the for_each_gpiochip_node() changes, I made
some mistakes by not disabling the clocks on the errorpath,
fix it up.

Fixes: a0912083 ("Merge tag 'intel-gpio-v5.19-1' of git://git.kernel.org/pub/scm/linux/kernel/git/andy/linux-gpio-intel

 into devel")
Cc: Stephen Rothwell <sfr@canb.auug.org.au>
Cc: Fabien Dessenne <fabien.dessenne@foss.st.com>
Reported-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>