curl_threads: fix MSVC compiler warning

Use LongToHandle to convert from long to HANDLE in the Win32
implementation.
This should fix the following warning when compiling with
MSVC 11 (2012) in 64-bit mode:
lib\curl_threads.c(113): warning C4306:
'type cast' : conversion from 'long' to 'HANDLE' of greater size

Closes https://github.com/curl/curl/pull/1717

diff --git a/lib/curl_threads.c b/lib/curl_threads.c
index 19897107a5638344cc53389adebe0cd7302ee308..c1624a913668e21a24e473755fea365be3e7e175 100644 (file)
--- a/lib/curl_threads.c
+++ b/lib/curl_threads.c
@@ -110,7 +110,7 @@ curl_thread_t Curl_thread_create(unsigned int (CURL_STDCALL *func) (void *),
 #else
   t = (curl_thread_t)_beginthreadex(NULL, 0, func, arg, 0, NULL);
 #endif
-  if((t == 0) || (t == (curl_thread_t)-1L)) {
+  if((t == 0) || (t == LongToHandle(-1L))) {
 #ifdef _WIN32_WCE
     DWORD gle = GetLastError();
     errno = ((gle == ERROR_ACCESS_DENIED ||