auxdisplay: charlcd: fix hex literal ranges for graphics command
The graphics command expects 16 hexadecimal literals, but would allow characters in range [0-9a-zA-Z] instead of [0-9a-fA-F]. Signed-off-by: NRobert Abel <rabel@robertabel.eu> Acked-by: NWilly Tarreau <w@1wt.eu> Reviewed-by: NGeert Uytterhoeven <geert@linux-m68k.org> Signed-off-by: NMiguel Ojeda <miguel.ojeda.sandonis@gmail.com>
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