Avoid memory leak.

src/android/test/interop/app/src/main/cpp/grpc-interop.cc

@@ -51,7 +51,9 @@ Java_io_grpc_interop_cpp_InteropActivity_doEmpty(JNIEnv* env, jobject obj_this,
   int port = static_cast<int>(port_raw);
   bool use_tls = static_cast<bool>(use_tls_raw);
 
-  return GetClient(host, port, use_tls)->DoEmpty();
+  jboolean result = GetClient(host, port, use_tls)->DoEmpty();
+  env->ReleaseStringUTFChars(host_raw, host);
+  return result;
 }
 
 extern "C" JNIEXPORT jboolean JNICALL
@@ -64,7 +66,9 @@ Java_io_grpc_interop_cpp_InteropActivity_doLargeUnary(JNIEnv* env,
   int port = static_cast<int>(port_raw);
   bool use_tls = static_cast<bool>(use_tls_raw);
 
-  return GetClient(host, port, use_tls)->DoLargeUnary();
+  jboolean result = GetClient(host, port, use_tls)->DoLargeUnary();
+  env->ReleaseStringUTFChars(host_raw, host);
+  return result;
 }
 
 extern "C" JNIEXPORT jboolean JNICALL
@@ -77,7 +81,9 @@ Java_io_grpc_interop_cpp_InteropActivity_doEmptyStream(JNIEnv* env,
   int port = static_cast<int>(port_raw);
   bool use_tls = static_cast<bool>(use_tls_raw);
 
-  return GetClient(host, port, use_tls)->DoEmptyStream();
+  jboolean result = GetClient(host, port, use_tls)->DoEmptyStream();
+  env->ReleaseStringUTFChars(host_raw, host);
+  return result;
 }
 
 extern "C" JNIEXPORT jboolean JNICALL
@@ -88,7 +94,9 @@ Java_io_grpc_interop_cpp_InteropActivity_doRequestStreaming(
   int port = static_cast<int>(port_raw);
   bool use_tls = static_cast<bool>(use_tls_raw);
 
-  return GetClient(host, port, use_tls)->DoRequestStreaming();
+  jboolean result = GetClient(host, port, use_tls)->DoRequestStreaming();
+  env->ReleaseStringUTFChars(host_raw, host);
+  return result;
 }
 
 extern "C" JNIEXPORT jboolean JNICALL
@@ -99,7 +107,9 @@ Java_io_grpc_interop_cpp_InteropActivity_doResponseStreaming(
   int port = static_cast<int>(port_raw);
   bool use_tls = static_cast<bool>(use_tls_raw);
 
-  return GetClient(host, port, use_tls)->DoResponseStreaming();
+  jboolean result = GetClient(host, port, use_tls)->DoResponseStreaming();
+  env->ReleaseStringUTFChars(host_raw, host);
+  return result;
 }
 
 extern "C" JNIEXPORT jboolean JNICALL
@@ -112,5 +122,7 @@ Java_io_grpc_interop_cpp_InteropActivity_doPingPong(JNIEnv* env,
   int port = static_cast<int>(port_raw);
   bool use_tls = static_cast<bool>(use_tls_raw);
 
-  return GetClient(host, port, use_tls)->DoPingPong();
+  jboolean result = GetClient(host, port, use_tls)->DoPingPong();
+  env->ReleaseStringUTFChars(host_raw, host);
+  return result;
 }