wifi: mt76: mt7925: fix typo in mt7925_init_he_caps

Use iftype for interface type switch in mt7925_init_he_caps routine. This found
during code review but later Coverity reported this with id 1549845.

Fixes: c948b5da ("wifi: mt76: mt7925: add Mediatek Wi-Fi7 driver for mt7925 chips")
Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
Signed-off-by: Kalle Valo <kvalo@kernel.org>
Link: https://lore.kernel.org/r/7de6e939dc75ee08f05bf1ee73253aa7eeccf28e.1699869649.git.lorenzo@kernel.org

drivers/net/wireless/mediatek/mt76/mt7925/main.c

@@ -53,7 +53,7 @@ mt7925_init_he_caps(struct mt792x_phy *phy, enum nl80211_band band,
 		IEEE80211_HE_PHY_CAP2_UL_MU_FULL_MU_MIMO |
 		IEEE80211_HE_PHY_CAP2_UL_MU_PARTIAL_MU_MIMO;
 
-	switch (i) {
+	switch (iftype) {
 	case NL80211_IFTYPE_AP:
 		he_cap_elem->mac_cap_info[2] |=
 			IEEE80211_HE_MAC_CAP2_BSR;