Remove double lookup of UIManager

Summary:
Remove double lookup of UIManager, cast of null returns null.

changelog: [internal]

Reviewed By: ejanzer

Differential Revision: D25453878

fbshipit-source-id: c727c15fa787981eb5bf02006184e14cfab319c6

ReactAndroid/src/main/java/com/facebook/react/uimanager/UIManagerHelper.java

@@ -52,11 +52,7 @@ public class UIManagerHelper {
       @UIManagerType int uiManagerType,
       boolean returnNullIfCatalystIsInactive) {
     if (context.isBridgeless()) {
-      @Nullable
-      UIManager uiManager =
-          context.getJSIModule(JSIModuleType.UIManager) != null
-              ? (UIManager) context.getJSIModule(JSIModuleType.UIManager)
-              : null;
+      @Nullable UIManager uiManager = (UIManager) context.getJSIModule(JSIModuleType.UIManager);
       if (uiManager == null) {
         ReactSoftException.logSoftException(
             "UIManagerHelper",