Use ArgumentNullException.ThrowIfNull helper method

Did a simple search/replace on the whole repo (except the RSSDP project)
This reduces LOC and should improve performance (methods containing a throw statement don't get inlined)

```
if \((\w+) == null\)
\s+\{
\s+throw new ArgumentNullException\((.*)\);
\s+\}
```

```
ArgumentNullException.ThrowIfNull($1);
```

1 files changed, 2 insertions, 8 deletions

diff --git a/MediaBrowser.Controller/Net/BasePeriodicWebSocketListener.cs b/MediaBrowser.Controller/Net/BasePeriodicWebSocketListener.cs
index eadc09fd4..647de5003 100644
--- a/MediaBrowser.Controller/Net/BasePeriodicWebSocketListener.cs
+++ b/MediaBrowser.Controller/Net/BasePeriodicWebSocketListener.cs
@@ -38,10 +38,7 @@ namespace MediaBrowser.Controller.Net
 
         protected BasePeriodicWebSocketListener(ILogger<BasePeriodicWebSocketListener<TReturnDataType, TStateType>> logger)
         {
-            if (logger == null)
-            {
-                throw new ArgumentNullException(nameof(logger));
-            }
+            ArgumentNullException.ThrowIfNull(logger);
 
             Logger = logger;
         }
@@ -77,10 +74,7 @@ namespace MediaBrowser.Controller.Net
         /// <returns>Task.</returns>
         public Task ProcessMessageAsync(WebSocketMessageInfo message)
         {
-            if (message == null)
-            {
-                throw new ArgumentNullException(nameof(message));
-            }
+            ArgumentNullException.ThrowIfNull(message);
 
             if (message.MessageType == StartType)
             {