KVM: selftests: Remove unneeded semicolon

Remove unnecessary semicolons reported by Coccinelle/coccicheck and the
semantic patch at scripts/coccinelle/misc/semicolon.cocci.

Signed-off-by: Chen Ni <nichen@iscas.ac.cn>
Link: https://lore.kernel.org/r/20241126073744.453434-1-nichen@iscas.ac.cn
Signed-off-by: Sean Christopherson <seanjc@google.com>

Author: Chen Ni

tools/testing/selftests/kvm/access_tracking_perf_test.c

@@ -239,7 +239,7 @@ static void vcpu_thread_main(struct memstress_vcpu_args *vcpu_args)
 		case ITERATION_MARK_IDLE:
 			mark_vcpu_memory_idle(vm, vcpu_args);
 			break;
-		};
+		}
 
 		vcpu_last_completed_iteration[vcpu_idx] = current_iteration;
 	}