(svn r9) Fixed a couple of warnings and minor coding issues

namegen.c

@@ -1977,7 +1977,6 @@ TownNameGenerator * const _town_name_generators[] = {
 
 uint32 GetOldTownName(uint32 townnameparts, byte old_town_name_type)
 {
-	uint32 a = 0;
 	switch (old_town_name_type) {
 		case 0: case 3: /* English, American */
 			/*	Already OK */

network.c

@@ -1173,7 +1173,7 @@ bool NetworkUDPSearchServer() {
 }
 
 
-#else // ENABLE_NETWORK
+#else // not ENABLE_NETWORK
 
 // stubs
 void NetworkInitialize(const char *hostname) {}
@@ -1187,5 +1187,5 @@ void NetworkProcessCommands() {}
 void NetworkStartSync() {}
 void NetworkUDPListen(int port) {}
 void NetworkUDPReceive() {}
-bool NetworkUDPSearchServer() {}
+bool NetworkUDPSearchServer() { return false; }
 #endif // ENABLE_NETWORK

ttd.c

@@ -491,7 +491,7 @@ int ttd_main(int argc, char* argv[])
 		case 'v': ttd_strlcpy(videodriver, mgo.opt, sizeof(videodriver)); break;
 		case 'n': {
 				network = 1; 
-				if ((bool)mgo.opt) {
+				if (mgo.opt) {
 					network_conn = mgo.opt; 
 					network++;
 				}

w32dm.c

@@ -111,4 +111,4 @@ static void DMusicMidiSetVolume(byte vol)
 	SetVolume(vol);
 }
 
-#endif
+#endif

win32.c

@@ -562,7 +562,7 @@ static void FindResolutions()
 }
 
 
-static char *Win32GdiStart(char **parm)
+static const char *Win32GdiStart(char **parm)
 {
 	memset(&_wnd, 0, sizeof(_wnd));
 	_wnd.cursor_visible = true;