[LIBC] Fix comments / name of __sched_cpu_count tests

[goldstein.w.n]

Summary

Test was incorrectly named/commented after the sched_{set|get}affinity
functions.

[goldstein.w.n]

Fix comment

[michaelrj]

LGTM, thanks for fixing this.

libc/test/src/sched/cpu_count_test.cpp

-//===-- Unittests for sched_getaffinity and sched_setaffinity -------------===//
+//===-- Unittests for __sched_cpu_count -----------------------------------===//
 //
 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
 // See https://llvm.org/LICENSE.txt for license information.
 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
 #include "src/__support/OSUtil/syscall.h"
 #include "src/errno/libc_errno.h"
 #include "src/sched/sched_getaffinity.h"
 #include "src/sched/sched_getcpucount.h"
 #include "test/ErrnoSetterMatcher.h"
 
 #include <sched.h>
 #include <sys/syscall.h>
 
-TEST(LlvmLibcSchedAffinityTest, SmokeTest) {
+TEST(LlvmLibcSchedCpuCountTest, SmokeTest) {
   cpu_set_t mask;
   libc_errno = 0;
   using __llvm_libc::testing::ErrnoSetterMatcher::Succeeds;
   pid_t tid = __llvm_libc::syscall_impl(SYS_gettid);
   ASSERT_GT(tid, pid_t(0));
   ASSERT_THAT(__llvm_libc::sched_getaffinity(tid, sizeof(cpu_set_t), &mask),
               Succeeds(0));
 
   // CPU_COUNT is a macro, but it expands to an LLVM-libc internal function that
   // needs to be in the appropriate namespace for the test.
   int num_cpus = __llvm_libc::CPU_COUNT(&mask);
   ASSERT_GT(num_cpus, 0);
   ASSERT_LE(num_cpus, int(sizeof(cpu_set_t) * sizeof(unsigned long)));
 }