fix UB with the function iscntrl() - dmenu - dynamic menu
 (HTM) git clone git://git.suckless.org/dmenu
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       ---
 (DIR) commit e73651f12a406629778f02d8e5acbe2caec0dfc2
 (DIR) parent 31fa07b9849b0ffbf4b7efb55943f466b3ff160f
 (HTM) Author: Hiltjo Posthuma <hiltjo@codemadness.org>
       Date:   Sat, 26 Mar 2022 17:58:47 +0100
       
       fix UB with the function iscntrl()
       
       From commit 6818e07291f3b2913e687c8ec3d3fe4711724050 by NRK, thanks
       
       Diffstat:
         M dmenu.c                             |       2 +-
       
       1 file changed, 1 insertion(+), 1 deletion(-)
       ---
 (DIR) diff --git a/dmenu.c b/dmenu.c
       @@ -415,7 +415,7 @@ keypress(XKeyEvent *ev)
                switch(ksym) {
                default:
        insert:
       -                if (!iscntrl(*buf))
       +                if (!iscntrl((unsigned char)*buf))
                                insert(buf, len);
                        break;
                case XK_Delete: