Add missing returns (osrf#23)

Signed-off-by: Ivan Santiago Paunovic <ivanpauno@ekumenlabs.com>

Author: ivanpauno

rcljava/src/main/cpp/org_ros2_rcljava_detail_QosIncompatibleStatus.cpp

@@ -51,6 +51,7 @@ Java_org_ros2_rcljava_detail_QosIncompatibleStatus_nativeFromRCLEvent(
   if (!p) {
     rcljava_throw_exception(
       env, "java/lang/IllegalArgumentException", "passed rmw object handle is NULL");
+    return;
   }
   // TODO(ivanpauno): class and field lookup could be done at startup time
   jclass clazz = env->GetObjectClass(self);

rcljava/src/main/cpp/org_ros2_rcljava_publisher_statuses_LivelinessLost.cpp

@@ -50,6 +50,7 @@ Java_org_ros2_rcljava_publisher_statuses_LivelinessLost_nativeFromRCLEvent(
   if (!p) {
     rcljava_throw_exception(
       env, "java/lang/IllegalArgumentException", "passed rmw object handle is NULL");
+    return;
   }
   // TODO(ivanpauno): class and field lookup could be done at startup time
   jclass clazz = env->GetObjectClass(self);

rcljava/src/main/cpp/org_ros2_rcljava_publisher_statuses_OfferedDeadlineMissed.cpp

@@ -50,6 +50,7 @@ Java_org_ros2_rcljava_publisher_statuses_OfferedDeadlineMissed_nativeFromRCLEven
   if (!p) {
     rcljava_throw_exception(
       env, "java/lang/IllegalArgumentException", "passed rmw object handle is NULL");
+    return;
   }
   // TODO(ivanpauno): class and field lookup could be done at startup time
   jclass clazz = env->GetObjectClass(self);

rcljava/src/main/cpp/org_ros2_rcljava_subscription_statuses_LivelinessChanged.cpp

@@ -50,6 +50,7 @@ Java_org_ros2_rcljava_subscription_statuses_LivelinessChanged_nativeFromRCLEvent
   if (!p) {
     rcljava_throw_exception(
       env, "java/lang/IllegalArgumentException", "passed rmw object handle is NULL");
+    return;
   }
   // TODO(ivanpauno): class and field lookup could be done at startup time
   jclass clazz = env->GetObjectClass(self);

rcljava/src/main/cpp/org_ros2_rcljava_subscription_statuses_RequestedDeadlineMissed.cpp

@@ -50,6 +50,7 @@ Java_org_ros2_rcljava_subscription_statuses_RequestedDeadlineMissed_nativeFromRC
   if (!p) {
     rcljava_throw_exception(
       env, "java/lang/IllegalArgumentException", "passed rmw object handle is NULL");
+    return;
   }
   // TODO(ivanpauno): class and field lookup could be done at startup time
   jclass clazz = env->GetObjectClass(self);