MIPS: wrppmc: Fix build of PCI code.

  CC      arch/mips/wrppmc/pci.o
/home/ralf/src/linux/linux-mips/arch/mips/wrppmc/pci.c: In function ‘gt64120_pci_init’:
/home/ralf/src/linux/linux-mips/arch/mips/wrppmc/pci.c:41:6: error: variable ‘tmp’ set but not used [-Werror=unused-but-set-variable]
cc1: all warnings being treated as errors

This warning exists in gcc 4.6.0 and newer.  Kernels 2.6.40 and newer use
-Wunused-but-set-variable to suppress it.
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

arch/mips/wrppmc/pci.c

@@ -38,10 +38,8 @@ static struct pci_controller hose_0 = {
 
 static int __init gt64120_pci_init(void)
 {
-	u32 tmp;
-
-	tmp = GT_READ(GT_PCI0_CMD_OFS);		/* Huh??? -- Ralf  */
-	tmp = GT_READ(GT_PCI0_BARE_OFS);
+	(void) GT_READ(GT_PCI0_CMD_OFS);	/* Huh??? -- Ralf  */
+	(void) GT_READ(GT_PCI0_BARE_OFS);
 
 	/* reset the whole PCI I/O space range */
 	ioport_resource.start = GT_PCI_IO_BASE;