Ignore sendtype/sendcount if MPI_IN_PLACE

This commit was SVN r7361.

ompi/mpi/c/allgatherv.c

@@ -51,7 +51,9 @@ int MPI_Allgatherv(void *sendbuf, int sendcount, MPI_Datatype sendtype,
           return OMPI_ERRHANDLER_INVOKE(comm, MPI_ERR_ARG, FUNC_NAME);
 	}
 
-        OMPI_CHECK_DATATYPE_FOR_SEND(err, sendtype, sendcount);
+        if (MPI_IN_PLACE != sendbuf) {
+            OMPI_CHECK_DATATYPE_FOR_SEND(err, sendtype, sendcount);
+        }
         OMPI_ERRHANDLER_CHECK(err, comm, err, FUNC_NAME);
 
         size = ompi_comm_size(comm);