Zero ioport_opaque on isa_unassign_ioport

If the io port is unassigned, the previous private pointer is
meaningless.

Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Signed-off-by: Avi Kivity <avi@qumranet.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/vl.c b/vl.c
index 74183627f..562786296 100644
--- a/vl.c
+++ b/vl.c
@@ -399,6 +399,8 @@ void isa_unassign_ioport(int start, int length)
         ioport_write_table[0][i] = default_ioport_writeb;
         ioport_write_table[1][i] = default_ioport_writew;
         ioport_write_table[2][i] = default_ioport_writel;
+
+        ioport_opaque[i] = NULL;
     }
 }