iwlwifi: pcie: free context info in case of failures

If iwl_pcie_ctxt_info_init_fw_sec() fails, the previous allocated DMA
memory needs to be freed (it even goes out of scope immediately.)
Do that to prevent the leak.

Fixes: eda50cde58de ("iwlwifi: pcie: add context information support")
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>

drivers/net/wireless/intel/iwlwifi/pcie/ctxt-info.c

@@ -241,8 +241,11 @@ int iwl_pcie_ctxt_info_init(struct iwl_trans *trans,
 
 	/* allocate ucode sections in dram and set addresses */
 	ret = iwl_pcie_ctxt_info_init_fw_sec(trans, fw, ctxt_info);
-	if (ret)
+	if (ret) {
+		dma_free_coherent(trans->dev, sizeof(*trans_pcie->ctxt_info),
+				  ctxt_info, trans_pcie->ctxt_info_dma_addr);
 		return ret;
+	}
 
 	trans_pcie->ctxt_info = ctxt_info;