efi_loader: missing parentheses after if

IS_ENABLED() contains parentheses. But we should still put extra
parentheses around it in an if statement for readability.

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
diff --git a/lib/efi_loader/efi_boottime.c b/lib/efi_loader/efi_boottime.c
index 03053e8..3ab5eb5 100644
--- a/lib/efi_loader/efi_boottime.c
+++ b/lib/efi_loader/efi_boottime.c
@@ -2161,7 +2161,7 @@
 	}
 
 	if (!efi_st_keep_devices) {
-		if IS_ENABLED(CONFIG_USB_DEVICE)
+		if (IS_ENABLED(CONFIG_USB_DEVICE))
 			udc_disconnect();
 		board_quiesce_devices();
 		dm_remove_devices_flags(DM_REMOVE_ACTIVE_ALL);