NFSv4.1: Simplify setting the layout header credential
NFSv4.1: Simplify setting the layout header credential

ctx->cred == ctx->state->owner->so_cred, so let's just use the former.

Signed-off-by: Trond Myklebust <6a1f9db795c9fc44be97d66ab114c53193bd3d13@netapp.com>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs