Fixed 2 Coverity reported issues. Both issues are benign, but I've addressed then as with the changes the

code is clean and more mantainable.

CID 11676: Uninitialized scalar field (UNINIT_CTOR)
Non-static class member cancelMode is not initialized in this constructor nor in any functions that it calls.
Non-static class member cpunum is not initialized in this constructor nor in any functions that it calls.
Non-static class member detached is not initialized in this constructor nor in any functions that it calls.
Non-static class member isRunning is not initialized in this constructor nor in any functions that it calls.
Non-static class member stackSize is not initialized in this constructor nor in any functions that it calls.
Non-static class member threadPolicy is not initialized in this constructor nor in any functions that it calls.
Non-static class member threadPriority is not initialized in this constructor nor in any functions that it calls.
Non-static class member uniqueId is not initialized in this constructor nor in any functions that it calls.

CID 11564: Unsigned compared against 0 (NO_EFFECT)
This less-than-zero comparison of an unsigned value is never true. "cpunum < 0U".

src/OpenThreads/win32/Win32Thread.cpp

@@ -231,6 +231,19 @@ int Thread::GetConcurrency() {
     return -1;
 }
 
+Win32ThreadPrivateData::Win32ThreadPrivateData()
+{
+    stackSize = 0;
+    isRunning = false;
+    cancelMode = 0;
+    uniqueId = 0;
+    threadPriority = Thread::THREAD_PRIORITY_DEFAULT;
+    threadPolicy = Thread::THREAD_SCHEDULE_DEFAULT;
+    detached = false;
+    cancelEvent.set(CreateEvent(NULL,TRUE,FALSE,NULL));
+    cpunum = -1;
+}
+
 //----------------------------------------------------------------------------
 //
 // Description: Constructor
@@ -244,16 +257,6 @@ Thread::Thread() {
 
     Win32ThreadPrivateData *pd = new Win32ThreadPrivateData();
 
-    pd->stackSize = 0;
-    pd->isRunning = false;
-    pd->cancelMode = 0;
-    pd->uniqueId = 0;
-    pd->threadPriority = Thread::THREAD_PRIORITY_DEFAULT;
-    pd->threadPolicy = Thread::THREAD_SCHEDULE_DEFAULT;
-    pd->detached = false;
-    pd->cancelEvent.set(CreateEvent(NULL,TRUE,FALSE,NULL));
-    pd->cpunum = -1;
-
     _prvData = static_cast<void *>(pd);
 }
 
@@ -678,8 +681,6 @@ int OpenThreads::GetNumberOfProcessors()
 
 int OpenThreads::SetProcessorAffinityOfCurrentThread(unsigned int cpunum)
 {
-    if (cpunum<0) return -1;
-    
     Thread::Init();
 
     Thread* thread = Thread::CurrentThread();