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, 1 insertions, 4 deletions

diff --git a/MediaBrowser.Controller/IO/FileData.cs b/MediaBrowser.Controller/IO/FileData.cs
index 2429ac42d..71feae536 100644
--- a/MediaBrowser.Controller/IO/FileData.cs
+++ b/MediaBrowser.Controller/IO/FileData.cs
@@ -40,10 +40,7 @@ namespace MediaBrowser.Controller.IO
                 throw new ArgumentNullException(nameof(path));
             }
 
-            if (args == null)
-            {
-                throw new ArgumentNullException(nameof(args));
-            }
+            ArgumentNullException.ThrowIfNull(args);
 
             var entries = directoryService.GetFileSystemEntries(path);