the main problem is that you should never alter core files … the next time WordPress does an update it might overwrite the file you just changed.
you should not have needed to use a multisite for your scenario – you can have a portfolio and blog in the same setup using plugins or a great theme (even without using something called custom post types).
I’m not certain of a fix but have a look at this and contact @Ipstenu or @AndreaR on the Multisite forum for why you shouldn’t do this
http://wordpress.org/support/topic/subsite-taking-over-the-parent-site?replies=10
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