Missing unlocks in sdlz.c

** CID 1443038:  Program hangs  (LOCK)
/lib/dns/sdlz.c: 633 in getnodedata()


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*** CID 1443038:  Program hangs  (LOCK)
/lib/dns/sdlz.c: 633 in getnodedata()
627     				wild = fname;
628     			}
629     
630     			isc_buffer_init(&b, wildstr, sizeof(wildstr));
631     			result = dns_name_totext(wild, true, &b);
632     			if (result != ISC_R_SUCCESS)
   CID 1443038:  Program hangs  (LOCK)
   Returning without unlocking "sdlz->dlzimp->driverlock".
633     				return (result);
634     			isc_buffer_putuint8(&b, 0);
635     
636     			result = sdlz->dlzimp->methods->lookup(zonestr, wildstr,
637     						       sdlz->dlzimp->driverarg,
638     						       sdlz->dbdata, node,


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