Fix CIDs 830, 831, 858: minor resource leaks on error

This commit was SVN r19237.

ompi/mpi/cxx/comm.cc

@@ -132,6 +132,7 @@ MPI::Comm::do_create_keyval(MPI_Comm_copy_attr_function* c_copy_fn,
         ++count;
     }
     if (2 != count) {
+        free(cxx_extra_state);
         return OMPI_ERRHANDLER_INVOKE(MPI_COMM_WORLD, MPI_ERR_ARG, 
                                       "MPI::Comm::Create_keyval");
     }

ompi/mpi/cxx/datatype.cc

@@ -88,6 +88,7 @@ MPI::Datatype::do_create_keyval(MPI_Type_copy_attr_function* c_copy_fn,
         ++count;
     }
     if (2 != count) {
+        free(cxx_extra_state);
         return OMPI_ERRHANDLER_INVOKE(MPI_COMM_WORLD, MPI_ERR_ARG, 
                                       "MPI::Datatype::Create_keyval");
     }

ompi/mpi/cxx/win.cc

@@ -103,6 +103,7 @@ MPI::Win::do_create_keyval(MPI_Win_copy_attr_function* c_copy_fn,
         ++count;
     }
     if (2 != count) {
+        free(cxx_extra_state);
         return OMPI_ERRHANDLER_INVOKE(MPI_COMM_WORLD, MPI_ERR_ARG, 
                                       "MPI::Win::Create_keyval");
     }