Fixed duplicate call to NtCurrentTeb

(cherry picked from commit ca1fe0193e2728635b415478dc366939817cfb6c)

winpr/libwinpr/error/error.c

@@ -44,7 +44,7 @@ DWORD GetLastError(VOID)
 	PTEB pt = NtCurrentTeb();
 	if (pt)
 	{
-		return NtCurrentTeb()->LastErrorValue;
+		return pt->LastErrorValue;
 	}
 	return ERROR_OUTOFMEMORY;
 }