rt: Expand rust_kernel::live_tasks to a uintptr_t

Author: brson

src/rt/rust_kernel.cpp

@@ -84,7 +84,7 @@ rust_kernel::fail() {
 
 void
 rust_kernel::register_task(rust_task *task) {
- int new_live_tasks;
+ uintptr_t new_live_tasks;
  {
  scoped_lock with(task_lock);
  task->user.id = max_task_id++;
@@ -99,7 +99,7 @@ rust_kernel::register_task(rust_task *task) {
 void
 rust_kernel::release_task_id(rust_task_id id) {
  KLOG_("Releasing task %" PRIdPTR, id);
- int new_live_tasks;
+ uintptr_t new_live_tasks;
  {
  scoped_lock with(task_lock);
  task_table.remove(id);

src/rt/rust_kernel.h

@@ -27,7 +27,7 @@ class rust_kernel {
  // Tracks the number of tasks that are being managed by
  // schedulers. When this hits 0 we will tell all schedulers
  // to exit.
- int live_tasks;
+ uintptr_t live_tasks;
  // The next task id
  rust_task_id max_task_id;
  hash_map<rust_task_id, rust_task *> task_table;