wifi: mt76: mt7921: resource leaks at mt7921_check_offload_capability()

Fixed coverity issue with resource leaks at variable "fw" going out of
scope leaks the storage it points to mt7921_check_offload_capability().
Reported-by: coverity-bot <keescook+coverity-bot@chromium.org>
Addresses-Coverity-ID: 1527806 ("Resource leaks")
Fixes: 034ae28b ("wifi: mt76: mt7921: introduce remain_on_channel support")
Signed-off-by: Sean Wang <sean.wang@mediatek.com>
Signed-off-by: Felix Fietkau <nbd@nbd.name>

drivers/net/wireless/mediatek/mt76/mt7921/init.c

@@ -175,7 +175,7 @@ u8 mt7921_check_offload_capability(struct device *dev, const char *fw_wm)
 
 	if (!fw || !fw->data || fw->size < sizeof(*hdr)) {
 		dev_err(dev, "Invalid firmware\n");
-		return -EINVAL;
+		goto out;
 	}
 
 	data = fw->data;
@@ -206,6 +206,7 @@ u8 mt7921_check_offload_capability(struct device *dev, const char *fw_wm)
 		data += le16_to_cpu(rel_info->len) + rel_info->pad_len;
 	}
 
+out:
 	release_firmware(fw);
 
 	return features ? features->data : 0;