Insert conversion to reduce warnings.

* clang otherwise about having more cases than enum values.

tests/test_xmap_intersection_parallel.c

@@ -438,7 +438,7 @@ int main(int argc, char **argv)
         {.pos = (int[]){5,4,3,2,1,0}, .num_pos = 6};
       recv_messages.rank = (comm_size + my_rank - 1) % comm_size;
 
-      switch(curr_reorder_type) {
+      switch((int)curr_reorder_type) {
         case(XT_REORDER_SEND_UP):
           xt_quicksort_int_permutation(
             (int*)send_messages.pos, (size_t)count, (int*)recv_messages.pos);