storage/posix: UNWIND right op_error and op_errno in *setxattr()

1. errno was being set after gf_log() in posix_{f}handle_pair, this
would cause errno to be overwritten.

2. dht would expect -1 for indication of failure in setxattr
callback (dht_err_cbk()). posix_{f}setxattr has been changed to set
op_ret as -1 instead of -op_errno.

3. dict_foreach() has been changed to return an error if the invoked
fn() returns < 0.

Bug report and test case credits to Zorro Lang <zlang@redhat.com>

Change-Id: I96c15f12a5d7717b7584ba392f390a0b4f704a98
BUG: 1051896
Signed-off-by: Vijay Bellur <vbellur@redhat.com>
Reviewed-on: http://review.gluster.org/6684
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Niels de Vos <ndevos@redhat.com>
Reviewed-by: Anand Avati <avati@redhat.com>

0 files changed, 0 insertions, 0 deletions