[PATCH] Enable /dev/mapper/dm-[0-9]-* scanning

[Oleg Solovyov <mcpain@basealt.ru>]

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This code was modified because the original code skips any device with 
basename starts with /dm-[0-9]/
e.g. if the root device path is //dev/mapper/dm-0-luks/ it won't be 
detected by grub-probe and "root=" parameter in grub.cfg will be empty 
and the system will be unbootable unless you manually edit grub.cfg

BUG: https://savannah.gnu.org/bugs/?53697

> diff --git a/grub/grub-core/osdep/unix/getroot.c 
> b/grub/grub-core/osdep/unix/getroot.c
> index 4bf37b0..2964dcd 100644
> --- a/grub/grub-core/osdep/unix/getroot.c
> +++ b/grub/grub-core/osdep/unix/getroot.c
> @@ -433,7 +433,8 @@ grub_find_device (const char *dir, dev_t dev)
>            ent->d_name[1] == 'm' &&
>            ent->d_name[2] == '-' &&
>            ent->d_name[3] >= '0' &&
> -          ent->d_name[3] <= '9')
> +          ent->d_name[3] <= '9' &&
> +          ent->d_name[4] == '\0')
>          continue;
>  #endif
>
PS
I don't know what to do in case of //dev/dm-[0-9]+$/ yet

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