Fixed by zero'ing conv on allocation with Xcalloc. Then
close_converter works properly.

Using uninitialized value "conv->state" in call to function "close_converter"
Reviewed-by: Alan Coopersmith <alan.coopersmith@oracle.com>
Reviewed-by: Erkki Seppälä <erkki.seppala@vincit.fi>
Signed-off-by: Ander Conselvan de Oliveira <ander.conselvan-de-oliveira@nokia.com>
Signed-off-by: Alan Coopersmith <alan.coopersmith@oracle.com>
Backported-to-NX-by: Ulrich Sibiller <uli42@gmx.de>