libxl: Fix incorrect return of OSEVENT_HOOK macro

libxl: Fix incorrect return of OSEVENT_HOOK macro

The OSEVENT_HOOK_INTERN macro incorrectly returned the value of the
expression CTX->osevent_in_hook-- (usually 1) instead of the value of
the function call it made. Fix the macro to return the proper value.

Signed-off-by: Daniel De Graaf <dgdegra@tycho.nsa.gov>
Committed-by: Ian Jackson <ian.jackson.citrix.com>
Acked-by: Ian Jackson <ian.jackson@eu.citrix.com>
---
 tools/libxl/libxl_event.c |   28 ++++++++++++++++------------
 1 files changed, 16 insertions(+), 12 deletions(-)