Fix warning: Type cast is redundant (#2149)

Jellyfin.Api/Controllers/DisplayPreferencesController.cs

@@ -137,7 +137,7 @@ namespace Jellyfin.Api.Controllers
             }
 
             var existingDisplayPreferences = _displayPreferencesManager.GetDisplayPreferences(userId, itemId, client);
-            existingDisplayPreferences.IndexBy = Enum.TryParse<IndexingKind>(displayPreferences.IndexBy, true, out var indexBy) ? indexBy : (IndexingKind?)null;
+            existingDisplayPreferences.IndexBy = Enum.TryParse<IndexingKind>(displayPreferences.IndexBy, true, out var indexBy) ? indexBy : null;
             existingDisplayPreferences.ShowBackdrop = displayPreferences.ShowBackdrop;
             existingDisplayPreferences.ShowSidebar = displayPreferences.ShowSidebar;
 

Jellyfin.Api/Controllers/ItemUpdateController.cs

@@ -263,8 +263,8 @@ namespace Jellyfin.Api.Controllers
                 item.DateCreated = NormalizeDateTime(request.DateCreated.Value);
             }
 
-            item.EndDate = request.EndDate.HasValue ? NormalizeDateTime(request.EndDate.Value) : (DateTime?)null;
+            item.EndDate = request.EndDate.HasValue ? NormalizeDateTime(request.EndDate.Value) : null;
-            item.PremiereDate = request.PremiereDate.HasValue ? NormalizeDateTime(request.PremiereDate.Value) : (DateTime?)null;
+            item.PremiereDate = request.PremiereDate.HasValue ? NormalizeDateTime(request.PremiereDate.Value) : null;
             item.ProductionYear = request.ProductionYear;
             item.OfficialRating = string.IsNullOrWhiteSpace(request.OfficialRating) ? null : request.OfficialRating;
             item.CustomRating = request.CustomRating;

Jellyfin.Api/Helpers/ClaimHelpers.cs

@@ -20,7 +20,7 @@ namespace Jellyfin.Api.Helpers
             var value = GetClaimValue(user, InternalClaimTypes.UserId);
             return string.IsNullOrEmpty(value)
                 ? null
-                : (Guid?)Guid.Parse(value);
+                : Guid.Parse(value);
         }
 
         /// <summary>

Jellyfin.Server/Migrations/Routines/MigrateDisplayPreferencesDb.cs

@@ -120,7 +120,7 @@ namespace Jellyfin.Server.Migrations.Routines
 
                     var displayPreferences = new DisplayPreferences(dtoUserId, itemId, client)
                     {
-                        IndexBy = Enum.TryParse<IndexingKind>(dto.IndexBy, true, out var indexBy) ? indexBy : (IndexingKind?)null,
+                        IndexBy = Enum.TryParse<IndexingKind>(dto.IndexBy, true, out var indexBy) ? indexBy : null,
                         ShowBackdrop = dto.ShowBackdrop,
                         ShowSidebar = dto.ShowSidebar,
                         ScrollDirection = dto.ScrollDirection,

MediaBrowser.Model/Dlna/StreamBuilder.cs

@@ -1229,7 +1229,7 @@ namespace MediaBrowser.Model.Dlna
 
             bool result = IsAudioEligibleForDirectPlay(item, maxBitrate, playMethod);
 
-            return (result, result ? (TranscodeReason?)null : TranscodeReason.ContainerBitrateExceedsLimit);
+            return (result, result ? null : TranscodeReason.ContainerBitrateExceedsLimit);
         }
 
         public static SubtitleProfile GetSubtitleProfile(

RSSDP/SsdpDeviceLocator.cs

@@ -513,7 +513,7 @@ namespace Rssdp.Infrastructure
                 return TimeSpan.Zero;
             }
 
-            return (TimeSpan)(headerValue.MaxAge ?? headerValue.SharedMaxAge ?? TimeSpan.Zero);
+            return headerValue.MaxAge ?? headerValue.SharedMaxAge ?? TimeSpan.Zero;
         }
 
         private void RemoveExpiredDevicesFromCache()

tests/Jellyfin.Networking.Tests/NetworkParseTests.cs

@@ -20,7 +20,7 @@ namespace Jellyfin.Networking.Tests
                 CallBase = true
             };
             configManager.Setup(x => x.GetConfiguration(It.IsAny<string>())).Returns(conf);
-            return (IConfigurationManager)configManager.Object;
+            return configManager.Object;
         }
 
         /// <summary>