xenbus: don't BUG() on user mode induced condition

xenbus: don't BUG() on user mode induced condition

commit 0beef634b86a1350c31da5fcc2992f0d7c8a622b upstream.

Inability to locate a user mode specified transaction ID should not
lead to a kernel crash. For other than XS_TRANSACTION_START also
don't issue anything to xenbus if the specified ID doesn't match that
of any active transaction.

Signed-off-by: Jan Beulich <jbeulich@suse.com>
Signed-off-by: David Vrabel <david.vrabel@citrix.com>
Cc: Ed Swierk <eswierk@skyportsystems.com>
[bwh: Backported to 3.2: adjust filename, context]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>