If Galloway ceases to be a British Citizen, a Citizen of the Commonwealth or Republic of Ireland and as the SNP has not given any indication on what status newly independent Scots will have in relation to the commonwealth or whether they wish to negotiate the same terms as the Republic of Ireland it is not necessarily true that Galloway would be able to continue as an MP regardless of whether people would vote for him or not.
Again, more definitive statements for undefined positions seems to be the order of the day.
Scotland will still be within the auspices of the UK until the next general election.