[openwrt/openwrt] scripts/gen_image_generic.sh: use /bin/sh

[LEDE Commits]

ynezz pushed a commit to openwrt/openwrt.git, branch master:
https://git.openwrt.org/aee169b06d72c1a1f42be4809e8e6c8368ca2532

commit aee169b06d72c1a1f42be4809e8e6c8368ca2532
Author: Rosen Penev <rosenp at gmail.com>
AuthorDate: Sun Jan 5 18:22:55 2020 -0800

    scripts/gen_image_generic.sh: use /bin/sh
    
    This has nothing bash specific.
    
    Signed-off-by: Rosen Penev <rosenp at gmail.com>
---
 scripts/gen_image_generic.sh | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/scripts/gen_image_generic.sh b/scripts/gen_image_generic.sh
index 8091d95575..9d05b6254e 100755
--- a/scripts/gen_image_generic.sh
+++ b/scripts/gen_image_generic.sh
@@ -1,4 +1,4 @@
-#!/usr/bin/env bash
+#!/bin/sh
 # Copyright (C) 2006-2012 OpenWrt.org
 set -e -x
 if [ $# -ne 5 ] && [ $# -ne 6 ]; then