interconnect: icc-clk: check return values of devm_kasprintf()

devm_kasprintf() can fail and return NULL, add missing return value
checks.

Fixes: 0ac2a08f ("interconnect: add clk-based icc provider support")
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Link: https://lore.kernel.org/r/20241202165723.17292-1-brgl@bgdev.pl


Signed-off-by: Georgi Djakov <djakov@kernel.org>