Fix RCTNativeTraceEndSection calls

Summary: public

For "some" reason, exception is never `NULL`, it's `null` (the JavaScript value),
so the calls will never finish.

Reviewed By: javache

Differential Revision: D2625896

fb-gh-sync-id: fc8176a6ac485bfecc9903db05bf69b39ac2d9b4

React/Executors/RCTContextExecutor.m

@@ -202,9 +202,7 @@ static JSValueRef RCTNativeTraceEndSection(JSContextRef context, __unused JSObje
 {
   if (argumentCount > 0) {
     double tag = JSValueToNumber(context, arguments[0], exception);
-    if (exception == NULL) {
-      RCTProfileEndEvent((uint64_t)tag, @"console", nil);
-    }
+    RCTProfileEndEvent((uint64_t)tag, @"console", nil);
   }
 
   return JSValueMakeUndefined(context);