default initialize MPI_Requests

src/amdis/common/parallel/Collective.hpp

@@ -70,7 +70,7 @@ namespace AMDiS { namespace Mpi
     int size = 1;
     MPI_Comm_size(comm, &size);
     out.resize(size);
-    MPI_Request request;
+    MPI_Request request = MPI_REQUEST_NULL;
     MPI_Iallgather(to_void_ptr(&in), 1, type_to_mpi<T>(), to_void_ptr(out.data()), 1, type_to_mpi<T>(), comm, &request);
 
     return {request};
@@ -82,7 +82,7 @@ namespace AMDiS { namespace Mpi
     int size = 1;
     MPI_Comm_size(comm, &size);
     out.resize(size * N);
-    MPI_Request request;
+    MPI_Request request = MPI_REQUEST_NULL;
     MPI_Iallgather(to_void_ptr(in.data()), N, type_to_mpi<T>(), to_void_ptr(out.data()), N, type_to_mpi<T>(), comm, &request);
 
     return {request};