Trivial changes in open4_claim_deleg()

Removed utfname validation checks as nfs4_utf8string2dynamic does the
same. glist_entry() never returns NULL, so removed that check!

Signed-off-by: Malahal Naineni <malahal@us.ibm.com>
Fix a logDebug accessing incorrect utf8string with CLAIM_DELEGATE_PREV

Signed-off-by: Malahal Naineni <malahal@us.ibm.com>
Fail requests with bad stateid in CLAIM_DELEGATE_CUR claim type

Signed-off-by: Malahal Naineni <malahal@us.ibm.com>