[mgcp] Possible memleak fix for the allowed reallocation case

When allowing to reallocate an allocated endpoint we will need
to free it first. When freeing we will free the call id and other
ids that we would have leaked otherwise.

openbsc/src/mgcp/mgcp_protocol.c

@@ -389,6 +389,7 @@ static struct msgb *handle_create_con(struct mgcp_config *cfg, struct msgb *msg)
 		if (cfg->force_realloc) {
 			LOGP(DMGCP, LOGL_NOTICE, "Endpoint 0x%x already allocated. Forcing realloc.\n",
 			    ENDPOINT_NUMBER(endp));
+			mgcp_free_endp(endp);
 		} else {
 			LOGP(DMGCP, LOGL_ERROR, "Endpoint is already used. 0x%x\n",
 			     ENDPOINT_NUMBER(endp));