sunrpc: fix potential race between setting use_gss_proxy and the upcall rpc_clnt
An nfsd thread can call use_gss_proxy and find it set to '1' but find gssp_clnt still NULL, so that when it attempts the upcall the result will be an unnecessary -EIO. So, ensure that gssp_clnt is created first, and set the use_gss_proxy variable only if that succeeds. Signed-off-by: NJeff Layton <jlayton@redhat.com> Signed-off-by: NJ. Bruce Fields <bfields@redhat.com>
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