wifi: iwlwifi: pcie: propagate iwl_pcie_gen2_apm_init() error

If iwl_pcie_gen2_apm_init() fails, we should propagate the
error code up, rather than ignoring it.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Gregory Greenman <gregory.greenman@intel.com>
Link: https://lore.kernel.org/r/20230926110319.883768afe77b.Ic47cb8ce0a0abba3b4745cc2a721217c33360d6c@changeid


Signed-off-by: Johannes Berg <johannes.berg@intel.com>