[MIPS] IP32: Fix warnings.

    
The expressions are volatile; no need for temporary variables.
    
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

arch/mips/sgi-ip32/ip32-irq.c

@@ -31,12 +31,12 @@
 /* issue a PIO read to make sure no PIO writes are pending */
 static void inline flush_crime_bus(void)
 {
-	volatile unsigned long junk = crime->control;
+	crime->control;
 }
 
 static void inline flush_mace_bus(void)
 {
-	volatile unsigned long junk = mace->perif.ctrl.misc;
+	mace->perif.ctrl.misc;
 }
 
 #undef DEBUG_IRQ