fix: deadlock during SSL_ForceHandshake when getting connection to replica

Resolves: #1125152
Author: Jan Synacek <jsynacek@redhat.com>

--- a/libraries/libldap/tls_m.c	2015-05-25 12:28:30.326645997 +0200
+++ b/libraries/libldap/tls_m.c	2015-05-25 12:33:38.143399149 +0200
@@ -141,7 +141,6 @@ static int tlsm_init( void );
 */
 static ldap_pvt_thread_mutex_t tlsm_ctx_count_mutex;
 static ldap_pvt_thread_mutex_t tlsm_init_mutex;
-static ldap_pvt_thread_mutex_t tlsm_pem_mutex;
 static PRCallOnceType tlsm_init_mutex_callonce = {0,0};
 
 static PRStatus PR_CALLBACK
@@ -159,12 +158,6 @@ tlsm_thr_init_callonce( void )
 		return PR_FAILURE;
 	}
 
-	if ( ldap_pvt_thread_mutex_init( &tlsm_pem_mutex ) ) {
-		Debug( LDAP_DEBUG_ANY,
-			   "TLS: could not create mutex for PEM module: %d\n", errno, 0, 0 );
-		return PR_FAILURE;
-	}
-
 	return PR_SUCCESS;
 }
 
@@ -2037,7 +2030,6 @@ tlsm_destroy( void )
 #ifdef LDAP_R_COMPILE
 	ldap_pvt_thread_mutex_destroy( &tlsm_ctx_count_mutex );
 	ldap_pvt_thread_mutex_destroy( &tlsm_init_mutex );
-	ldap_pvt_thread_mutex_destroy( &tlsm_pem_mutex );
 #endif
 }
 
@@ -2672,16 +2664,9 @@ static int
 tlsm_session_accept_or_connect( tls_session *session, int is_accept )
 {
 	tlsm_session *s = (tlsm_session *)session;
-	int rc;
+	int rc = SSL_ForceHandshake( s );
 	const char *op = is_accept ? "accept" : "connect";
 
-	if ( pem_module ) {
-		LDAP_MUTEX_LOCK( &tlsm_pem_mutex );
-	}
-	rc = SSL_ForceHandshake( s );
-	if ( pem_module ) {
-		LDAP_MUTEX_UNLOCK( &tlsm_pem_mutex );
-	}
 	if ( rc ) {
 		PRErrorCode err = PR_GetError();
 		rc = -1;