mpi.Request: avoid calling JNI free if it is null

This commit was SVN r30806.

ompi/mpi/java/c/mpi_Request.c

@@ -79,21 +79,8 @@ JNIEXPORT jlong JNICALL Java_mpi_Request_free(
         JNIEnv *env, jobject jthis, jlong handle)
 {
     MPI_Request req = (MPI_Request)handle;
-
-    if(req != MPI_REQUEST_NULL)
-    {
-        if(req == NULL)
-        {
-            req = MPI_REQUEST_NULL;
-        }
-        else
-        {
-            /* Handle is NULL when we create a Prequest object. */
-            int rc = MPI_Request_free(&req);
-            ompi_java_exceptionCheck(env, rc);
-        }
-    }
-
+    int rc = MPI_Request_free(&req);
+    ompi_java_exceptionCheck(env, rc);
     return (jlong)req;
 }
 

ompi/mpi/java/java/Request.java

@@ -71,8 +71,11 @@ protected Request(long handle)
  */
 @Override public void free() throws MPIException
 {
-    MPI.check();
-    handle = free(handle);
+    if(!isNull())
+    {
+        MPI.check();
+        handle = free(handle);
+    }
 }
 
 private native long free(long req) throws MPIException;