Fix bounds checks of dc.col - st - personal variant of st
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       ---
 (DIR) commit a6bbc0c96b0a1db804061b0db79101c6b26aec57
 (DIR) parent eb3b894f4076f2b25afc644a1f444b5cbd96aae8
 (HTM) Author: Peter Hofmann <scm@uninformativ.de>
       Date:   Sat,  7 Oct 2023 07:39:00 +0200
       
       Fix bounds checks of dc.col
       
       dc.collen is the length of dc.col, not the maximum index, hence if x is
       equal to dc.collen, then it's an error.
       
       With config.def.h, the last valid index is 259, so this correctly
       reports "black":
       
           $ printf '\033]4;259;?\e\\'
       
       260 is an invalid index and this reports garbage instead of printing an
       error:
       
           $ printf '\033]4;260;?\e\\'
       
       Diffstat:
         M x.c                                 |       4 ++--
       
       1 file changed, 2 insertions(+), 2 deletions(-)
       ---
 (DIR) diff --git a/x.c b/x.c
       @@ -818,7 +818,7 @@ xloadcols(void)
        int
        xgetcolor(int x, unsigned char *r, unsigned char *g, unsigned char *b)
        {
       -        if (!BETWEEN(x, 0, dc.collen))
       +        if (!BETWEEN(x, 0, dc.collen - 1))
                        return 1;
        
                *r = dc.col[x].color.red >> 8;
       @@ -833,7 +833,7 @@ xsetcolorname(int x, const char *name)
        {
                Color ncolor;
        
       -        if (!BETWEEN(x, 0, dc.collen))
       +        if (!BETWEEN(x, 0, dc.collen - 1))
                        return 1;
        
                if (!xloadcolor(x, name, &ncolor))