mpc83xx: km83xx_i2c - fix gcc 4.6 compiler warning

Configuring for kmeter1 board...
km83xx_i2c.c: In function 'i2c_make_abort':
km83xx_i2c.c:44:8: warning: variable 'dummy' set but not used [-Wunused-but-set-variable]

Signed-off-by: Kim Phillips <kim.phillips@freescale.com>
Acked-by: Heiko Schocher <hs@denx.de>

board/keymile/km83xx/km83xx_i2c.c

@@ -41,7 +41,6 @@ int i2c_make_abort(void)
 {
 	struct fsl_i2c *dev;
 	dev = (struct fsl_i2c *) (CONFIG_SYS_IMMR + CONFIG_SYS_I2C_OFFSET);
-	uchar	dummy;
 	uchar   last;
 	int     nbr_read = 0;
 	int     i = 0;
@@ -52,7 +51,7 @@ int i2c_make_abort(void)
 	udelay(DELAY_ABORT_SEQ);
 	out_8(&dev->cr, (I2C_CR_MEN | I2C_CR_MSTA));
 	udelay(DELAY_ABORT_SEQ);
-	dummy = in_8(&dev->dr);
+	in_8(&dev->dr);
 	udelay(DELAY_ABORT_SEQ);
 	last = in_8(&dev->dr);
 	nbr_read++;