tls: fix disabled-tls compilation

guess these snuck in after my last round of testing.

memcached.c

@@ -906,7 +906,7 @@ static void conn_close(conn *c) {
 
     MEMCACHED_CONN_RELEASE(c->sfd);
     conn_set_state(c, conn_closed);
-    if (c->ssl) {
+    if (c->ssl_enabled) {
         ssl_conn_close(c->ssl);
     }
     close(c->sfd);

memcached.h

@@ -482,6 +482,7 @@ struct settings {
     bool lru_maintainer_thread; /* LRU maintainer background thread */
     bool lru_segmented;     /* Use split or flat LRU's */
     bool slab_reassign;     /* Whether or not slab reassignment is allowed */
+    bool ssl_enabled; /* indicates whether SSL is enabled */
     int slab_automove;     /* Whether or not to automatically move slabs */
     double slab_automove_ratio; /* youngest must be within pct of oldest */
     unsigned int slab_automove_window; /* window mover for algorithm */
@@ -521,7 +522,6 @@ struct settings {
     double ext_max_frag; /* ideal maximum page fragmentation */
     double slab_automove_freeratio; /* % of memory to hold free as buffer */
     bool ext_drop_unread; /* skip unread items during compaction */
-    bool ssl_enabled; /* indicates whether SSL is enabled */
     /* start flushing to extstore after memory below this */
     unsigned int ext_global_pool_min;
 #endif
@@ -834,8 +834,8 @@ struct conn {
     bool close_after_write; /** flush write then move to close connection */
     bool rbuf_malloced; /** read buffer was malloc'ed for ascii mget, needs free() */
     bool item_malloced; /** item for conn_nread state is a temporary malloc */
-#ifdef TLS
     bool ssl_enabled;
+#ifdef TLS
     void    *ssl;
     char   *ssl_wbuf;
 #endif

tls.c

@@ -419,6 +419,8 @@ int ssl_init(void) {
  * SSL_OP_NO_RENEGOTIATION option in SSL_CTX_set_options.
  */
 void ssl_callback(const SSL *s, int where, int ret) {
+    // useful for debugging.
+    // fprintf(stderr, "WHERE: %d RET: %d CODE: %s LONG: %s\n", where, ret, SSL_state_string(s), SSL_state_string_long(s));
 #ifndef SSL_OP_NO_RENEGOTIATION
     SSL* ssl = (SSL*)s;
     if (SSL_in_before(ssl)) {

tls.h

@@ -12,12 +12,14 @@ void ssl_help(void);
 bool ssl_set_verify_mode(int verify);
 bool ssl_set_min_version(int version);
 const char *ssl_proto_text(int version);
+void ssl_help(void);
 #else
 #define ssl_init(void)
 #define ssl_init_conn(c, ssl)
 #define ssl_init_settings(void)
 #define ssl_conn_close(ssl)
 #define ssl_accept(c, sfd, fail) NULL
+#define ssl_help()
 #endif
 
 #endif