iwlwifi: actually check allocated conf_tlv pointer

Commit 71bc033 ("iwlwifi: check allocated pointer when allocating
conf_tlvs") attempted to fix a typoe introduced by commit 17b809c
("iwlwifi: dbg: move debug data to a struct") but does not implement the
check correctly.

Fixes: 71bc033 ("iwlwifi: check allocated pointer when allocating conf_tlvs")
Tweeted-by: @grsecurity
Signed-off-by: Chris Rorvick <[email protected]>
Signed-off-by: Sedat Dilek <[email protected]>
Signed-off-by: Kalle Valo <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

Author: crorvick

drivers/net/wireless/intel/iwlwifi/iwl-drv.c

@@ -1467,7 +1467,7 @@ static void iwl_req_fw_callback(const struct firmware *ucode_raw, void *context)
 				kmemdup(pieces->dbg_conf_tlv[i],
 					pieces->dbg_conf_tlv_len[i],
 					GFP_KERNEL);
-			if (!pieces->dbg_conf_tlv[i])
+			if (!drv->fw.dbg.conf_tlv[i])
 				goto out_free_fw;
 		}
 	}