Clear security sensitive data

As password is sensitive data Clear after use.

Tested:
Verified using ipmitool commands
Command: ipmitool user set password 5 asdf1234 //Set user password
Response: Set User Password command successful (user 5)
Command: ipmitool raw 6 0x47 5 2 0x30 0x70 0x65 0x6e 0x42 0x6d 0x63
         0x31 0 0 0 0 0 0 0 0   //set user password - set password
Response:                //Success
Command: ipmitool raw 6 0x47 5 3 0x30 0x70 0x65 0x6e 0x42 0x6d 0x63
         0x31 0 0 0 0 0 0 0 0  //set user password - test password
Response:                //Success

Signed-off-by: Jayaprakash Mutyala <mutyalax.jayaprakash@intel.com>
Change-Id: I06196233ac5468534bd10fd34f99f7d35fd7b971
diff --git a/user_channel/channel_layer.hpp b/user_channel/channel_layer.hpp
index bddd6b5..42e5b5e 100644
--- a/user_channel/channel_layer.hpp
+++ b/user_channel/channel_layer.hpp
@@ -14,6 +14,8 @@
 // limitations under the License.
 */
 #pragma once
+#include <openssl/crypto.h>
+
 #include <array>
 #include <ipmid/api.hpp>
 #include <string>