RDMA/iwpm: Delete unnecessary checks before the macro call "dev_kfree_skb"

The dev_kfree_skb() function performs also input parameter validation.
Thus the test around the shown calls is not needed.

This issue was detected by using the Coccinelle software.

Link: https://lore.kernel.org/r/16df4c50-1f61-d7c4-3fc8-3073666d281d@web.deSigned-off-by: Markus Elfring <elfring@users.sourceforge.net>
Reviewed-by: Jason Gunthorpe <jgg@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>

drivers/infiniband/core/iwpm_msg.c

@@ -124,8 +124,7 @@ int iwpm_register_pid(struct iwpm_dev_data *pm_msg, u8 nl_client)
 	return ret;
 pid_query_error:
 	pr_info("%s: %s (client = %d)\n", __func__, err_str, nl_client);
-	if (skb)
-		dev_kfree_skb(skb);
+	dev_kfree_skb(skb);
 	if (nlmsg_request)
 		iwpm_free_nlmsg_request(&nlmsg_request->kref);
 	return ret;
@@ -214,8 +213,7 @@ int iwpm_add_mapping(struct iwpm_sa_data *pm_msg, u8 nl_client)
 add_mapping_error:
 	pr_info("%s: %s (client = %d)\n", __func__, err_str, nl_client);
 add_mapping_error_nowarn:
-	if (skb)
-		dev_kfree_skb(skb);
+	dev_kfree_skb(skb);
 	if (nlmsg_request)
 		iwpm_free_nlmsg_request(&nlmsg_request->kref);
 	return ret;
@@ -308,8 +306,7 @@ int iwpm_add_and_query_mapping(struct iwpm_sa_data *pm_msg, u8 nl_client)
 query_mapping_error:
 	pr_info("%s: %s (client = %d)\n", __func__, err_str, nl_client);
 query_mapping_error_nowarn:
-	if (skb)
-		dev_kfree_skb(skb);
+	dev_kfree_skb(skb);
 	if (nlmsg_request)
 		iwpm_free_nlmsg_request(&nlmsg_request->kref);
 	return ret;

drivers/infiniband/core/iwpm_util.c

@@ -655,8 +655,7 @@ static int send_mapinfo_num(u32 mapping_num, u8 nl_client, int iwpm_pid)
 	return 0;
 mapinfo_num_error:
 	pr_info("%s: %s\n", __func__, err_str);
-	if (skb)
-		dev_kfree_skb(skb);
+	dev_kfree_skb(skb);
 	return ret;
 }
 
@@ -778,8 +777,7 @@ int iwpm_send_mapinfo(u8 nl_client, int iwpm_pid)
 send_mapping_info_exit:
 	if (ret) {
 		pr_warn("%s: %s (ret = %d)\n", __func__, err_str, ret);
-		if (skb)
-			dev_kfree_skb(skb);
+		dev_kfree_skb(skb);
 		return ret;
 	}
 	send_nlmsg_done(skb, nl_client, iwpm_pid);
@@ -834,7 +832,6 @@ int iwpm_send_hello(u8 nl_client, int iwpm_pid, u16 abi_version)
 	return 0;
 hello_num_error:
 	pr_info("%s: %s\n", __func__, err_str);
-	if (skb)
-		dev_kfree_skb(skb);
+	dev_kfree_skb(skb);
 	return ret;
 }