Fix ITS#1655, don't retrieve sd until we've checked for valid c_sb.

servers/slapd/connection.c

@@ -234,15 +234,15 @@ static Connection* connection_get( ber_socket_t s )
 		ber_socket_t i, sd;
 
 		for(i=0; i<dtblsize; i++) {
-			ber_sockbuf_ctrl( connections[i].c_sb,
-				LBER_SB_OPT_GET_FD, &sd );
-
 			if( connections[i].c_struct_state == SLAP_C_UNINITIALIZED ) {
 				assert( connections[i].c_conn_state == SLAP_C_INVALID );
 				assert( connections[i].c_sb == 0 );
 				break;
 			}
 
+			ber_sockbuf_ctrl( connections[i].c_sb,
+				LBER_SB_OPT_GET_FD, &sd );
+
 			if( connections[i].c_struct_state == SLAP_C_UNUSED ) {
 				assert( connections[i].c_conn_state == SLAP_C_INVALID );
 				assert( sd == AC_SOCKET_INVALID );