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If 'cpufreq_register_driver()' fails, we must release the resources
allocated in 'brcm_avs_prepare_init()' as already done in the remove
function.

To do that, introduce a new function 'brcm_avs_prepare_uninit()' in order
to avoid code duplication. This also makes the code more readable (IMHO).

Fixes: de322e08

 ("cpufreq: brcmstb-avs-cpufreq: AVS CPUfreq driver for Broadcom STB SoCs")
Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
[ Viresh: Updated Subject ]
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>