wifi: ath12k: initialize eirp_power before use

JIRA: https://issues.redhat.com/browse/RHEL-114889

commit bba2f9f
Author: Baochen Qiang <baochen.qiang@oss.qualcomm.com>
Date:   Mon Aug 4 11:03:10 2025 +0800

    wifi: ath12k: initialize eirp_power before use
    
    Currently, at the end of ath12k_mac_fill_reg_tpc_info(), the
    reg_tpc_info struct is populated, including the following:
    reg_tpc_info->is_psd_power = is_psd_power;
    reg_tpc_info->eirp_power = eirp_power;
    
    Kernel test robot complains on uninitialized symbol:
    drivers/net/wireless/ath/ath12k/mac.c:10069
    ath12k_mac_fill_reg_tpc_info() error: uninitialized symbol 'eirp_power'
    
    This is because there are some code paths that never set eirp_power, so
    the assignment of reg_tpc_info->eirp_power can come from an
    uninitialized variable. Functionally this is OK since the eirp_power
    only has meaning when is_psd_power is true, and all code paths which set
    is_psd_power to true also set eirp_power. However, to keep the robot
    happy, always initialize eirp_power before use.
    
    Tested-on: WCN7850 hw2.0 PCI WLAN.HMT.1.1.c5-00284-QCAHMTSWPL_V1.0_V2.0_SILICONZ-1
    
    Fixes: aeda163 ("wifi: ath12k: fill parameters for vdev set TPC power WMI command")
    Reported-by: kernel test robot <lkp@intel.com>
    Reported-by: Dan Carpenter <dan.carpenter@linaro.org>
    Closes: https://lore.kernel.org/r/202505180927.tbNWr3vE-lkp@intel.com/
    Signed-off-by: Baochen Qiang <baochen.qiang@oss.qualcomm.com>
    Reviewed-by: Vasanthakumar Thiagarajan <vasanthakumar.thiagarajan@oss.qualcomm.com>
    Link: https://patch.msgid.link/20250804-ath12k-fix-smatch-warning-on-6g-vlp-v1-1-56f1e54152ab@oss.qualcomm.com
    Signed-off-by: Jeff Johnson <jeff.johnson@oss.qualcomm.com>

Signed-off-by: Jose Ignacio Tornos Martinez <jtornosm@redhat.com>

Author: jtornosm

drivers/net/wireless/ath/ath12k/mac.c

@@ -11240,8 +11240,8 @@ void ath12k_mac_fill_reg_tpc_info(struct ath12k *ar,
 	struct ieee80211_channel *chan, *temp_chan;
 	u8 pwr_lvl_idx, num_pwr_levels, pwr_reduction;
 	bool is_psd_power = false, is_tpe_present = false;
-	s8 max_tx_power[ATH12K_NUM_PWR_LEVELS],
-		psd_power, tx_power, eirp_power;
+	s8 max_tx_power[ATH12K_NUM_PWR_LEVELS], psd_power, tx_power;
+	s8 eirp_power = 0;
 	struct ath12k_vif *ahvif = arvif->ahvif;
 	u16 start_freq, center_freq;
 	u8 reg_6ghz_power_mode;