Fixes #14269 - semaphore released too many times as it always happens in the finally, which is 1 too many times when the upload was a success

src/Umbraco.Web.BackOffice/Controllers/MediaController.cs

@@ -827,13 +827,10 @@ public class MediaController : ContentControllerBase
         }
         catch (Exception ex)
         {
+            _postAddFileSemaphore.Release();
             _logger.LogError(ex, "Something went wrong adding files");
             throw;
         }
-        finally
-        {
-            _postAddFileSemaphore.Release();
-        }
     }
 
     private bool IsFolderCreationAllowedHere(int parentId)