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/Emby.Server.Implementations/LiveTv/TunerHosts/M3uParser.cs b/Emby.Server.Implementations/LiveTv/TunerHosts/M3uParser.cs
index be06356a4f..a423ec8f48 100644
--- a/Emby.Server.Implementations/LiveTv/TunerHosts/M3uParser.cs
+++ b/Emby.Server.Implementations/LiveTv/TunerHosts/M3uParser.cs
@@ -44,10 +44,7 @@ namespace Emby.Server.Implementations.LiveTv.TunerHosts
 
         public async Task<Stream> GetListingsStream(TunerHostInfo info, CancellationToken cancellationToken)
         {
-            if (info == null)
-            {
-                throw new ArgumentNullException(nameof(info));
-            }
+            ArgumentNullException.ThrowIfNull(info);
 
             if (!info.Url.StartsWith("http", StringComparison.OrdinalIgnoreCase))
             {