iwlwifi: mei: fix potential NULL-ptr deref

If SKB allocation fails, continue rather than using the NULL
pointer.

Coverity CID: 1497650

Cc: stable@vger.kernel.org
Fixes: 2da4366f ("iwlwifi: mei: add the driver to allow cooperation with CSME")
Signed-off-by: NJohannes Berg <johannes.berg@intel.com>
Signed-off-by: NGregory Greenman <gregory.greenman@intel.com>
Link: https://lore.kernel.org/r/20220517120045.90c1b1fd534e.Ibb42463e74d0ec7d36ec81df22e171ae1f6268b0@changeidSigned-off-by: NJohannes Berg <johannes.berg@intel.com>

drivers/net/wireless/intel/iwlwifi/mei/main.c

@@ -1020,6 +1020,8 @@ static void iwl_mei_handle_sap_data(struct mei_cl_device *cldev,
 
 		/* We need enough room for the WiFi header + SNAP + IV */
 		skb = netdev_alloc_skb(netdev, len + QOS_HDR_IV_SNAP_LEN);
+		if (!skb)
+			continue;
 
 		skb_reserve(skb, QOS_HDR_IV_SNAP_LEN);
 		ethhdr = skb_push(skb, sizeof(*ethhdr));