get rid of some unused variables

--HG--
extra : convert_revision : 187cee0e0bad09bbaff059eb60f20d7d32c1b52c

dev/ide_ctrl.cc

@@ -63,9 +63,6 @@ IdeController::IdeController(const string &name, IntrControl *ic,
                              Bus *host_bus, Tick pio_latency, HierParams *hier)
     : PciDev(name, mmu, cf, cd, bus_num, dev_num, func_num), tsunami(t)
 {
-    // put back pointer into Tsunami
-    tsunami->disk_controller = this;
-
     // initialize the PIO interface addresses
     pri_cmd_addr = 0;
     pri_cmd_size = BARSize[0];

dev/ns_gige.cc

@@ -119,8 +119,6 @@ NSGigE::NSGigE(const std::string &name, IntrControl *i, Tick intr_delay,
       physmem(pmem), intctrl(i), intrTick(0), cpuPendingIntr(false),
       intrEvent(0), interface(0)
 {
-    tsunami->ethernet = this;
-
     if (header_bus) {
         pioInterface = newPioInterface(name, hier, header_bus, this,
                                        &NSGigE::cacheAccess);

dev/tsunami.hh

@@ -62,12 +62,9 @@ class Tsunami : public Platform
 
     /** Pointer to the system */
     System *system;
+
     /** Pointer to the TsunamiIO device which has the RTC */
     TsunamiIO *io;
-    /** Pointer to the disk controller device */
-    IdeController *disk_controller;
-    /** Pointer to the ethernet controller device */
-    NSGigE *ethernet;
 
     /** Pointer to the Tsunami CChip.
       * The chip contains some configuration information and