Correct the return type for main() in some samples

samples/syelog/sltestp.cpp

@@ -26,7 +26,7 @@ VOID MyErrExit(PCSTR pszMsg)
     exit(1);
 }
 
-DWORD main(int argc, char *argv[])
+int main(int argc, char *argv[])
 {
     HANDLE hPipe;
     SYELOG_MESSAGE Message;

samples/syelog/syelogd.cpp

@@ -449,7 +449,7 @@ BOOL WINAPI ControlHandler(DWORD dwCtrlType)
     return FALSE;
 }
 
-DWORD main(int argc, char **argv)
+int main(int argc, char **argv)
 {
     HANDLE hCompletionPort;
     BOOL fNeedHelp = FALSE;

samples/traceapi/testapi.cpp

@@ -78,7 +78,7 @@ VOID SyelogClose(BOOL fTerminate)
     (void)fTerminate;
 }
 
-DWORD main(int argc, char **argv)
+int main(int argc, char **argv)
 {
     (void)argc;
     (void)argv;

samples/tracebld/tracebld.cpp

@@ -377,7 +377,7 @@ DWORD CopyEnvironment(PWCHAR pwzzOut, PCWSTR pwzzIn)
 
 //////////////////////////////////////////////////////////////////////////////
 //
-DWORD main(int argc, char **argv)
+int main(int argc, char **argv)
 {
     HANDLE hCompletionPort;
     BOOL fNeedHelp = FALSE;