Fix missing unlocks in error cases!

Also, glist_entry() returned pointer should never be NULL, so checking
it is pointless!

Signed-off-by: Malahal Naineni <malahal@us.ibm.com>
Fix nfs4_acl_init call

exports_pkginit() may require ACL setup, so call nfs4_acl_init() before
calling exports_pkginit.

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