Return of_clk_add_hw_provider() in order to transfer the error if it
fails.

Fixes: 09be1a39 ("clk: qcom: kpss-xcc: register it as clk provider")
Signed-off-by: Chen Ni <nichen@iscas.ac.cn>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Link: https://lore.kernel.org/r/20240704073606.1976936-1-nichen@iscas.ac.cnSigned-off-by: Bjorn Andersson <andersson@kernel.org>