Solve fbjni bug to allow catching Java exception in JNI

Summary: This diff just adds the changes done here D12829542 for the OSS

Reviewed By: jknoxville

Differential Revision: D12839582

fbshipit-source-id: 0bdfa9e8e661309454709819af703499cd540ab4

libs/fbjni/cxx/fbjni/detail/Exceptions.cpp

@@ -1,5 +1,5 @@
 /*
- *  Copyright (c) 2018-present, Facebook, Inc.
+ *  Copyright (c) Facebook, Inc.
  *
  *  This source code is licensed under the MIT license found in the LICENSE
  *  file in the root directory of this source tree.
@@ -120,13 +120,13 @@ void throwPendingJniExceptionAsCppException() {
     return;
   }
 
-  auto throwable = adopt_local(env->ExceptionOccurred());
+  auto throwable = env->ExceptionOccurred();
   if (!throwable) {
     throw std::runtime_error("Unable to get pending JNI exception.");
   }
   env->ExceptionClear();
 
-  throw JniException(throwable);
+  throw JniException(adopt_local(throwable));
 }
 
 void throwCppExceptionIf(bool condition) {