Filtering on specific source ids fails with mysql error

On admin/content/migrate/process it's possible to enter in a comma separated list of source ids that you want to migrate. When you use this it fails with a mysql error :

user warning: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'IN (123))' at line 24 query "SELECT .... AND (cms_content. IN (123)) in /sites/all/modules/migrate/migrate.module on line 521."

Note the where clause doesn't have a column name specified. It's because $sourceid is used instead of $sourcekey. The attached patch fixes this issue.

Cheers,
Stella