arch, board: squash lines for immediate return

Remove unneeded variables and assignments.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Reviewed-by: Minkyu Kang <mk7.kang@samsung.com>
Reviewed-by: Angelo Dureghello <angelo@sysam.it>

board/ti/omap5_uevm/evm.c

@@ -245,10 +245,7 @@ int ehci_hcd_init(int index, enum usb_init_type init,
 
 int ehci_hcd_stop(void)
 {
-	int ret;
-
-	ret = omap_ehci_hcd_stop();
-	return ret;
+	return omap_ehci_hcd_stop();
 }
 
 void usb_hub_reset_devices(int port)