arch: disambiguate $(( in arch-syscall-validate
arch: disambiguate $(( in arch-syscall-validate

shellcheck complains:

> In arch-syscall-validate line 785:
> 	sc_list=$((for abi in $abi_list; do
>                 ^-- SC1102 (error): Shells disambiguate $(( differently or not at all. For $(command substitution), add space after $( . For $((arithmetics)), fix parsing errors.

Another tool, shfmt, can't even parse the file:

> arch-syscall-validate:785:17: not a valid arithmetic operator: abi

Add a space to resolve this.

Signed-off-by: Kir Kolyshkin <3a017b8ddb3f9cf3e4a59978b004111bdeb97f08@gmail.com>
Acked-by: Paul Moore <a027184a55211cd23e3f3094f1fdc728df5e0500@paul-moore.com>
Signed-off-by: Tom Hromatka <96b9c1f2c09b98d7a09b4688fc637f1494d8e182@oracle.com>

seccomp/libseccomp,seccomp/libseccomp,seccomp/libseccomp