mx28evk: Propagate the error if cpu_eth_init() fails

If cpu_eth_init() fails we should return the error immediately.

Cc: Marek Vasut <marex@denx.de>
Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com>
Acked-by: Marek Vasut <marex@denx.de>

board/denx/m28evk/m28evk.c

@@ -116,6 +116,8 @@ int board_eth_init(bd_t *bis)
 	int ret;
 
 	ret = cpu_eth_init(bis);
+	if (ret)
+		return ret;
 
 	clrsetbits_le32(&clkctrl_regs->hw_clkctrl_enet,
 		CLKCTRL_ENET_TIME_SEL_MASK | CLKCTRL_ENET_CLK_OUT_EN,