afr: coverity fixes

Some fixes for the 17th Dec 2014 run.
https://scan6.coverity.com:8443/reports.htm#v31028/p10714/g31029

Change-Id: Ia4410ef87a56fffb61803d0a4e62369b058e1cfb
BUG: 1176089
Signed-off-by: Ravishankar N <ravishankar@redhat.com>
Reviewed-on: http://review.gluster.org/9314
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Pranith Kumar Karampuri <pkarampu@redhat.com>
Tested-by: Pranith Kumar Karampuri <pkarampu@redhat.com>