--- \dll\iup\a\src\win\iupwindows_info.c	Thu Apr 19 08:22:24 2018
+++ iupwindows_info.c	Sat May 25 10:21:08 2019
@@ -87,7 +87,7 @@
   sprintf(str, "%d.%d.%d", (int)osvi.dwMajorVersion, (int)osvi.dwMinorVersion, (int)osvi.dwBuildNumber);
 
   /* Display service pack (if any). */
-  if (osvi.szCSDVersion && osvi.szCSDVersion[0]!=0)
+  if (osvi.szCSDVersion[0]!='\0')
   {
     strcat(str, " ");
     strcat(str, osvi.szCSDVersion);