imx: mx6: add missing return value

cc: Peng Fan <Peng.Fan@freescale.com>
Signed-off-by: Jeroen Hofstee <jeroen@myspectrum.nl>
Reviewed-by: Peng Fan <Peng.Fan@freescale.com>
Reviewed-by: Stefano Babic <sbabic@denx.de>

arch/arm/cpu/armv7/mx6/clock.c

@@ -727,6 +727,8 @@ int enable_lcdif_clock(u32 base_addr)
 	reg = readl(&imx_ccm->CCGR2);
 	reg |= MXC_CCM_CCGR2_LCD_MASK;
 	writel(reg, &imx_ccm->CCGR2);
+
+	return 0;
 }
 #endif