Please review patch for calendar crasher

Hi, I spent the weekend hunting down the bug that causes the Evolution
UI to freeze and produce a "double free or corruption (fasttop)" error
message from glibc when pasting calendar events.

The solution I found is a simple one-line removal of a g_free() call,
but I would like someone to review my analysis to make sure this does
not introduce a leak.

This bug is still present and easily reproducible on Evolution 2.6.3 and
2.7.90, and it would be good to see this committed before 2.8.

http://bugzilla.gnome.org/show_bug.cgi?id=334464#c14

Thanks,
Matthew Barnes