cluster/afr: Handle failures in fop_cbk gracefully

RCA:
Afr crashes when a last fop response fails and
'fop output' arguments are NULL. Afr does not handle
these gracefully.

Fix:
Changed the fops to not access the 'fop output' arguments
in case of failures.

Tests:
Changed afr wind_cbk code to fail the last response by setting
op_ret as -1 and op_errno as ENOMEM and setting all other output
variables as NULL to test the change. Removed the code to verify
success cases. No crashes or errors seen.

Change-Id: Iad9bc54db093a162f85bfb8dbeeda5b95acd21d8
BUG: 844689
Signed-off-by: Pranith Kumar K <pranithk@gluster.com>
Reviewed-on: http://review.gluster.com/3760
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Amar Tumballi <amarts@redhat.com>
Reviewed-by: Anand Avati <avati@redhat.com>

0 files changed, 0 insertions, 0 deletions