staging: unisys: visorbus: clean up visorchannel_clear

Goto label was ambiguous change to out_free_page to signify that
we will always go through the path even on success.

Signed-off-by: David Kershner <david.kershner@unisys.com>
Signed-off-by: Timothy Sell <timothy.sell@unisys.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>