util: make ScheduleBatchPriority advisory only

src/util/system.cpp

@@ -1126,17 +1126,13 @@ fs::path AbsPathForConfigVal(const fs::path& path, bool net_specific)
     return fs::absolute(path, GetDataDir(net_specific));
 }
 
-int ScheduleBatchPriority()
+void ScheduleBatchPriority()
 {
 #ifdef SCHED_BATCH
     const static sched_param param{};
-    if (int ret = pthread_setschedparam(pthread_self(), SCHED_BATCH, &param)) {
+    if (pthread_setschedparam(pthread_self(), SCHED_BATCH, &param) != 0) {
         LogPrintf("Failed to pthread_setschedparam: %s\n", strerror(errno));
-        return ret;
     }
-    return 0;
-#else
-    return 1;
 #endif
 }
 

src/util/system.h

@@ -367,10 +367,8 @@ std::string CopyrightHolders(const std::string& strPrefix);
  * On platforms that support it, tell the kernel the calling thread is
  * CPU-intensive and non-interactive. See SCHED_BATCH in sched(7) for details.
  *
- * @return The return value of sched_setschedule(), or 1 on systems without
- * sched_setschedule().
  */
-int ScheduleBatchPriority();
+void ScheduleBatchPriority();
 
 namespace util {