Fix port->pathname checks

Was always true since it's statically allocated

RRR
Mike W9MDB

src/cm108.c

@@ -82,7 +82,7 @@ int cm108_open(hamlib_port_t *port)
 	rig_debug(RIG_DEBUG_VERBOSE,"cm108:cm108_open called \n");
 
 
-	if (!port->pathname)
+	if (!port->pathname[0])
 		return -RIG_EINVAL;
 
 	fd = open(port->pathname, O_RDWR);

src/network.c

@@ -141,7 +141,7 @@ int network_open(hamlib_port_t *rp, int default_port)
 		hints.ai_socktype = SOCK_STREAM;
 
 	hoststr = NULL;								/* default of all local interfaces */
-	if (rp->pathname && rp->pathname[0] == ':')
+	if (rp->pathname[0] == ':')
 		{
 			portstr = rp->pathname + 1;
 		}

src/parallel.c

@@ -128,7 +128,7 @@ int par_open(hamlib_port_t *port)
 	int mode;
 #endif
 
-	if (!port->pathname)
+	if (!port->pathname[0])
 		return -RIG_EINVAL;
 
 #ifdef HAVE_LINUX_PPDEV_H