Fix buffer overflow

http://bugs.gentoo.org/show_bug.cgi?id=339901

--- GUI/xephem/tools/lx200xed/liblx200.c
+++ GUI/xephem/tools/lx200xed/liblx200.c
@@ -855,7 +855,7 @@
      return(LX200_FALSE);  /*Probably ought to verify all characters are acceptable*/
    szCmd[1]='L' + iSite;
    szCmd[2]='\0';
-   snprintf(szSite,6,"%3s",buf);
+   snprintf(szSite,4,"%3s",buf);
    return(lx200_set_generic(fd,szCmd,szSite));   
 }