MIPS: IP22: Fix GCC 4.6.0 build error

  CC      arch/mips/sgi-ip22/ip22-time.o
arch/mips/sgi-ip22/ip22-time.c: In function 'dosample':
arch/mips/sgi-ip22/ip22-time.c:35:10: error: variable 'lsb' set but not used [-Werror=unused-but-set-variable]
cc1: all warnings being treated as errors

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

arch/mips/sgi-ip22/ip22-time.c

@@ -32,7 +32,7 @@
 static unsigned long dosample(void)
 {
 	u32 ct0, ct1;
-	u8 msb, lsb;
+	u8 msb;
 
 	/* Start the counter. */
 	sgint->tcword = (SGINT_TCWORD_CNT2 | SGINT_TCWORD_CALL |
@@ -46,7 +46,7 @@ static unsigned long dosample(void)
 	/* Latch and spin until top byte of counter2 is zero */
 	do {
 		writeb(SGINT_TCWORD_CNT2 | SGINT_TCWORD_CLAT, &sgint->tcword);
-		lsb = readb(&sgint->tcnt2);
+		(void) readb(&sgint->tcnt2);
 		msb = readb(&sgint->tcnt2);
 		ct1 = read_c0_count();
 	} while (msb);