MIPS: IP27: Fix GCC 4.6.0 build error.

  CC      arch/mips/sgi-ip27/ip27-hubio.o
arch/mips/sgi-ip27/ip27-hubio.c: In function 'hub_pio_map':
arch/mips/sgi-ip27/ip27-hubio.c:32:20: error: variable 'junk' set but not used [-Werror=unused-but-set-variable]
cc1: all warnings being treated as errors
Signed-off-by: NRalf Baechle <ralf@linux-mips.org>

arch/mips/sgi-ip27/ip27-hubio.c

@@ -29,7 +29,6 @@ unsigned long hub_pio_map(cnodeid_t cnode, xwidgetnum_t widget,
 			  unsigned long xtalk_addr, size_t size)
 {
 	nasid_t nasid = COMPACT_TO_NASID_NODEID(cnode);
-	volatile hubreg_t junk;
 	unsigned i;
 
 	/* use small-window mapping if possible */
@@ -64,7 +63,7 @@ unsigned long hub_pio_map(cnodeid_t cnode, xwidgetnum_t widget,
 		 * after we write it.
 		 */
 		IIO_ITTE_PUT(nasid, i, HUB_PIO_MAP_TO_MEM, widget, xtalk_addr);
-		junk = HUB_L(IIO_ITTE_GET(nasid, i));
+		(void) HUB_L(IIO_ITTE_GET(nasid, i));
 
 		return NODE_BWIN_BASE(nasid, widget) + (xtalk_addr % BWIN_SIZE);
 	}