Fix error TNS-540 by adding WALLET_LOCATION into listener.ora as well, rather than sqlnet.ora alone

[oracle@vmxdb01 admin]$ lsnrctl status listener

LSNRCTL for Linux: Version 11.2.0.4.0 - Production on 02-JUL-2014 23:21:58

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Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=TCPS)(HOST=localhost)(PORT=1522)))
ORA-28759: failure to open file
TNS-12560: TNS:protocol adapter error
  TNS-00540: SSL protocol adapter failure

Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=IPC)(KEY=EXTPROC1521)))
STATUS of the LISTENER
------------------------
Alias                     LISTENER
Version                   TNSLSNR for Linux: Version 11.2.0.4.0 - Production
Start Date                02-JUL-2014 23:08:46
Uptime                    0 days 0 hr. 13 min. 12 sec
Trace Level               off
Security                  ON: Local OS Authentication
SNMP                      OFF
Listener Parameter File   /u01/app/11.2.0/grid/network/admin/listener.ora
Listener Log File         /u01/app/oracle/diag/tnslsnr/vmxdb01/listener/alert/log.xml
Listening Endpoints Summary...
  (DESCRIPTION=(ADDRESS=(PROTOCOL=tcps)(HOST=vmxdb01)(PORT=1522)))
  (DESCRIPTION=(ADDRESS=(PROTOCOL=ipc)(KEY=EXTPROC1521)))
  (DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=vmxdb01)(PORT=1521)))
Services Summary...
Service "+ASM" has 1 instance(s).
  Instance "+ASM", status READY, has 1 handler(s) for this service...
Service "orcl" has 1 instance(s).
  Instance "orcl", status READY, has 1 handler(s) for this service...
Service "orclXDB" has 1 instance(s).
  Instance "orcl", status READY, has 1 handler(s) for this service...
The command completed successfully