Deobfuscate cleanup path in clnt_vc_create(..)

Similar to r300836, r301800, and r302550, cl and ct will always
be non-NULL as they're allocated using the mem_alloc routines,
which always use malloc(..., M_WAITOK).

MFC after: 1 week
Reported by: Coverity
CID: 1007342
Sponsored by: EMC / Isilon Storage Division