Fix clear_status

[christiangnrd]

Probably missed because when there's a broken, failing, or erroring test this bug is hidden.

Before (bug is on Test Summary line):

                                 │          │ ──────────────── CPU ──────────────── │
Test                    (Worker) │ Time (s) │ GC (s) │ GC % │ Alloc (MB) │ RSS (MB) │
device/intrinsics/arguments  (3) │    14.06 │   0.33 │  2.4 │    2553.03 │   804.14 │
device/intrinsics/atomics    (2) │    20.33 │   0.44 │  2.2 │    4131.85 │   846.61 │

Test Summary: | Pass  Total   TimeA: ~0 min
  Overall     |  118    118  26.4s
    SUCCESS
     Testing Metal tests passed

This PR:

                                 │          │ ──────────────── CPU ──────────────── │
Test                    (Worker) │ Time (s) │ GC (s) │ GC % │ Alloc (MB) │ RSS (MB) │
device/intrinsics/arguments  (3) │    14.03 │   0.33 │  2.3 │    2552.47 │   806.64 │
device/intrinsics/atomics    (2) │    20.65 │   0.46 │  2.2 │    4132.25 │   852.47 │

Test Summary: | Pass  Total   Time
  Overall     |  118    118  27.4s
    SUCCESS
     Testing Metal tests passed

Includes a bonus unused variable cleanup.