Revert "minor perf improvement"

This reverts commit 1f165b2.

Author: DavidParks8

src/Microsoft.Owin.Security.Authorization/AuthorizationHelper.cs

@@ -75,7 +75,7 @@ public async Task<bool> IsAuthorizedAsync(IAuthorizationController controller, C
             }
 
             var policy = await AuthorizationPolicy.CombineAsync(policyProvider, new[] { authorizeAttribute });
-            return authorizationService.AuthorizeAsync(user, resource, policy);
+            return await authorizationService.AuthorizeAsync(user, resource, policy);
         }
 
         private AuthorizationOptions ResolveAuthorizationOptions(IAuthorizationController controller)

src/Microsoft.Owin.Security.Authorization/DefaultAuthorizationService.cs

@@ -181,7 +181,7 @@ public async Task<bool> AuthorizeAsync(ClaimsPrincipal user, object resource, st
                 throw new InvalidOperationException(ResourceHelper.FormatException_AuthorizationPolicyNotFound(policyName));
             }
 
-            return this.AuthorizeAsync(user, resource, policy);
+            return await this.AuthorizeAsync(user, resource, policy);
         }
     }
 }