mpc8220/i2c.c: Fix GCC 4.6 build warning

Fix:
i2c.c: In function 'wait_for_bb':
i2c.c:109:16: warning: variable 'temp' set but not used
[-Wunused-but-set-variable]

Signed-off-by: Wolfgang Denk <wd@denx.de>
Cc: Heiko Schocher <hs@denx.de>

arch/powerpc/cpu/mpc8220/i2c.c

@@ -105,15 +105,13 @@ static int wait_for_bb (void)
 	status = mpc_reg_in (&regs->sr);
 
 	while (timeout-- && (status & I2C_BB)) {
-#if 1
-		volatile int temp;
 
 		mpc_reg_out (&regs->cr, I2C_STA, I2C_STA);
-		temp = mpc_reg_in (&regs->dr);
+		(void)mpc_reg_in (&regs->dr);
 		mpc_reg_out (&regs->cr, 0, I2C_STA);
 		mpc_reg_out (&regs->cr, 0, 0);
 		mpc_reg_out (&regs->cr, I2C_EN, 0);
-#endif
+
 		udelay (1000);
 		status = mpc_reg_in (&regs->sr);
 	}