PJSIP: provide valid tcp nodelay option for reuse

When using TCP transport with chan_pjsip, the TCP_NODELAY
option value was allocated on the stack, then passed as a
pointer to the tcp transport configuration structure, and
later re-used on subsequently created sockets when it was
no longer valid.  This patch changes the allocation to be
a static.

ASTERISK-26180 #close
Reported by: Scott Griepentrog

Change-Id: I3251164c7f710dbdab031282f00e30a9770626a0

res/res_pjsip/config_transport.c

@@ -562,12 +562,13 @@ static int transport_apply(const struct ast_sorcery *sorcery, void *obj)
 		}
 	} else if (transport->type == AST_TRANSPORT_TCP) {
 		pjsip_tcp_transport_cfg cfg;
-		int option = 1;
+		static int option = 1;
 
 		pjsip_tcp_transport_cfg_default(&cfg, temp_state->state->host.addr.sa_family);
 		cfg.bind_addr = temp_state->state->host;
 		cfg.async_cnt = transport->async_operations;
 		set_qos(transport, &cfg.qos_params);
+		/* sockopt_params.options is copied to each newly connected socket */
 		cfg.sockopt_params.options[0].level = pj_SOL_TCP();
 		cfg.sockopt_params.options[0].optname = pj_TCP_NODELAY();
 		cfg.sockopt_params.options[0].optval = &option;