staging: unisys: visorbus: Cleanup bus_epilog goto statements

Cleaned up bus_epilogs vague gotos and in the process discovered
some error paths that could unlock a non locked semaphore.

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>