cpu: Restructure code to avoid pointless ret variable indirection

libavutil/cpu.c:133:9: warning: unused variable ‘ret’ [-Wunused-variable]

libavutil/cpu.c

@@ -130,27 +130,23 @@ int av_parse_cpu_flags(const char *s)
 
 int av_cpu_count(void)
 {
-    int ret, nb_cpus = 1;
+    int nb_cpus = 1;
 #if HAVE_SCHED_GETAFFINITY && defined(CPU_COUNT)
     cpu_set_t cpuset;
 
     CPU_ZERO(&cpuset);
 
-    ret = sched_getaffinity(0, sizeof(cpuset), &cpuset);
-    if (!ret) {
+    if (!sched_getaffinity(0, sizeof(cpuset), &cpuset))
         nb_cpus = CPU_COUNT(&cpuset);
-    }
 #elif HAVE_GETPROCESSAFFINITYMASK
     DWORD_PTR proc_aff, sys_aff;
-    ret = GetProcessAffinityMask(GetCurrentProcess(), &proc_aff, &sys_aff);
-    if (ret)
+    if (GetProcessAffinityMask(GetCurrentProcess(), &proc_aff, &sys_aff))
         nb_cpus = av_popcount64(proc_aff);
 #elif HAVE_SYSCTL && defined(HW_NCPU)
     int mib[2] = { CTL_HW, HW_NCPU };
     size_t len = sizeof(nb_cpus);
 
-    ret = sysctl(mib, 2, &nb_cpus, &len, NULL, 0);
-    if (ret == -1)
+    if (sysctl(mib, 2, &nb_cpus, &len, NULL, 0) == -1)
         nb_cpus = 0;
 #elif HAVE_SYSCONF && defined(_SC_NPROC_ONLN)
     nb_cpus = sysconf(_SC_NPROC_ONLN);