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The mlxbf_pmc_event_list() function returns a pointer to an array of supported events and the array size. The array size is returned via a pointer passed as an argument, which is mandatory. However, we want to be able to use mlxbf_pmc_event_list() just to check if a block name is implemented/supported. For this usage passing the size argument is not necessary so let's make it optional. Signed-off-by: Luiz Capitulino <luizcap@redhat.com> Reviewed-by: Hans de Goede <hdegoede@redhat.com> Link: https://lore.kernel.org/r/182de8ec6b9c33152f2ba6b248c35b0311abf5e4.1708635408.git.luizcap@redhat.com Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com> Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>