check the op_ret for less than zero in sp_create_cbk since posix can send negative values other than -1

posix can send -ve values other than -1 in create:

op_ret = setgid_override (this, real_path, &gid);

        if (op_ret < 0) {
                goto out;
        }

In stat-prefetch we check op_ret only for -1 which results in function
proceeding and op_ret may become 0 due to other function calls in
sp_create_cbk, hence crashes in fuse.

Signed-off-by: Raghavendra Bhat <raghavendrabhat@gluster.com>
Signed-off-by: Raghavendra G <raghavendra@gluster.com>
Signed-off-by: Anand V. Avati <avati@dev.gluster.com>

BUG: 2409 (crash in stat prefetch)
URL: http://bugs.gluster.com/cgi-bin/bugzilla3/show_bug.cgi?id=2409

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