qemu: zero ioport_opaque on isa_unassign_ioport (Marcelo Tosatti)
If the io port is unassigned, the previous private pointer is meaningless. Signed-off-by: NMarcelo Tosatti <mtosatti@redhat.com> Signed-off-by: NAnthony Liguori <aliguori@us.ibm.com> git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@6606 c046a42c-6fe2-441c-8c8c-71466251a162
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