ARM: OMAP2: remove useless variable 'ret'

Remove useless variable 'ret', the related warning:

arch/arm/mach-omap2/board-am3517crane.c:113:6: warning: unused variable ‘ret’ -Wunused-variable]
Signed-off-by: NChen Gang <gang.chen@asianux.com>
Signed-off-by: NTony Lindgren <tony@atomide.com>

arch/arm/mach-omap2/board-am3517crane.c

@@ -110,8 +110,6 @@ static void __init am3517_crane_i2c_init(void)
 
 static void __init am3517_crane_init(void)
 {
-	int ret;
-
 	omap3_mux_init(board_mux, OMAP_PACKAGE_CBB);
 	omap_serial_init();
 	omap_sdrc_init(NULL, NULL);