session: fix comment typo

Signed-off-by: Luka Perkov <luka.perkov@sartura.hr>
Reviewed-by: Andreas Schneider <asn@cryptomilk.org>

src/session.c

@@ -275,7 +275,7 @@ void ssh_free(ssh_session session) {
       }
   }
 
-  /* burn connection, it could hang sensitive datas */
+  /* burn connection, it could contain sensitive data */
   BURN_BUFFER(session, sizeof(struct ssh_session_struct));
   SAFE_FREE(session);
 }