Delete write only variables

Compiling with GCC 4.6.0 20100925 produced warnings like:
/src/qemu/net/tap-win32.c: In function 'tap_win32_open':
/src/qemu/net/tap-win32.c:582:12: error: variable 'hThread' set but not used [-Werror=unused-but-set-variable]

Fix by removing the unused variables.

Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
diff --git a/hw/ppce500_mpc8544ds.c b/hw/ppce500_mpc8544ds.c
index 1422fad..59d20d3 100644
--- a/hw/ppce500_mpc8544ds.c
+++ b/hw/ppce500_mpc8544ds.c
@@ -176,7 +176,6 @@
     int i=0;
     unsigned int pci_irq_nrs[4] = {1, 2, 3, 4};
     qemu_irq *irqs, *mpic, *pci_irqs;
-    SerialState * serial[2];
 
     /* Setup CPU */
     env = cpu_ppc_init("e500v2_v30");
@@ -200,15 +199,15 @@
 
     /* Serial */
     if (serial_hds[0]) {
-        serial[0] = serial_mm_init(MPC8544_SERIAL0_REGS_BASE,
-                                   0, mpic[12+26], 399193,
-                                   serial_hds[0], 1, 1);
+        serial_mm_init(MPC8544_SERIAL0_REGS_BASE,
+                       0, mpic[12+26], 399193,
+                       serial_hds[0], 1, 1);
     }
 
     if (serial_hds[1]) {
-        serial[0] = serial_mm_init(MPC8544_SERIAL1_REGS_BASE,
-                                   0, mpic[12+26], 399193,
-                                   serial_hds[0], 1, 1);
+        serial_mm_init(MPC8544_SERIAL1_REGS_BASE,
+                       0, mpic[12+26], 399193,
+                       serial_hds[0], 1, 1);
     }
 
     /* PCI */