wifi: mt76: mt7925: fix locking in mt7925_change_vif_links()

mainline inclusion
from mainline-v6.17-rc5
category: bugfix

&dev->mt76.mutex lock is taken using mt792x_mutex_acquire(dev) but not
released in one of the error paths, add the unlock to fix it.

Fixes: 5cd0bd8 ("wifi: mt76: mt7925: fix NULL deref check in mt7925_change_vif_links")
Reported-by: kernel test robot <lkp@intel.com>
Reported-by: Dan Carpenter <dan.carpenter@linaro.org>
Closes: https://lore.kernel.org/r/202503031055.3ZRqxhAl-lkp@intel.com/
Signed-off-by: Harshit Mogalapalli <harshit.m.mogalapalli@oracle.com>
Link: https://patch.msgid.link/20250727140416.1153406-1-harshit.m.mogalapalli@oracle.com
Signed-off-by: Felix Fietkau <nbd@nbd.name>
(cherry picked from commit 9f15701)
Signed-off-by: Wentao Guan <guanwentao@uniontech.com>

Author: harshimogalapalli

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

@@ -1982,8 +1982,10 @@ mt7925_change_vif_links(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
 					     GFP_KERNEL);
 			mlink = devm_kzalloc(dev->mt76.dev, sizeof(*mlink),
 					     GFP_KERNEL);
-			if (!mconf || !mlink)
+			if (!mconf || !mlink) {
+				mt792x_mutex_release(dev);
 				return -ENOMEM;
+			}
 		}
 
 		mconfs[link_id] = mconf;