Fixed possibly non-null terminated string in spgw.

srsepc/src/spgw/spgw.cc

@@ -175,7 +175,9 @@ spgw::init_sgi_if(spgw_args_t *args)
 
   memset(&ifr, 0, sizeof(ifr));
   ifr.ifr_flags = IFF_TUN | IFF_NO_PI;
-  strncpy(ifr.ifr_ifrn.ifrn_name, dev, IFNAMSIZ);
+  strncpy(ifr.ifr_ifrn.ifrn_name, dev, IFNAMSIZ-1);
+  ifr.ifr_ifrn.ifrn_name[IFNAMSIZ-1]='\0';
+
   if(ioctl(m_sgi_if, TUNSETIFF, &ifr) < 0)
   {
       m_spgw_log->error("Failed to set TUN device name: %s\n", strerror(errno));