Configfs network setup was broken (related to #338) (#353)

* Partially resolve #338: Configfs network setup was broken
* Ignore shellcheck warning
...because if we do what shellcheck recommends here, we end up with
exactly the code which we're reverting in this PR.

aports/main/postmarketos-mkinitfs/APKBUILD

@@ -1,5 +1,5 @@
 pkgname=postmarketos-mkinitfs
-pkgver=0.3.1
+pkgver=0.3.2
 pkgrel=1
 pkgdesc="Tool to generate initramfs images for postmarketOS"
 url="https://github.com/postmarketOS"
@@ -26,5 +26,5 @@ package() {
 	mkdir -p "$pkgdir/etc/postmarketos-mkinitfs/hooks/"
 }
 sha512sums="95e49eb5e7891d319543165290fb7279733e696db8c768d864d87ef36a20b04e1c4e8a1702a2927e7492ea2e9f3d4fdd83d9ea55811969689b9c2483fb3b44c4  init.sh.in
-66207a12dba2be8868d080e69e54dce43c8a3edbbd08a6585f8ad49034e32bbe9184c4c77b5fe49049d7475f930781f48919a12eb4d82c9e0008f6fa6da0d035  init_functions.sh
+64aa05363f79a0cf2319740753b8852f5252a5b35b23fecccb131cd77d306cd4c7fe287b2d58cea456f669ff99e20f53cf609703530abf6eda7c958a9e0811d2  init_functions.sh
 81ae1b6c1a96fbefe842b5e2cc8790c4c9761d9c714a8a6d6a623834e290e5255f5695740d38dc5bc2571aa0eeab54bb5ce69fe1457db5ef84b56d8a8e8eee9d  mkinitfs.sh"

aports/main/postmarketos-mkinitfs/init_functions.sh

@@ -214,7 +214,10 @@ setup_usb_network_configfs() {
 	printf "%s" "rndis" > $CONFIGFS/g1/configs/c.1/strings/0x409/configuration
 
 	ln -s $CONFIGFS/g1/functions/rndis.usb0 $CONFIGFS/g1/configs/c.1
-	ls /sys/class/udc > $CONFIGFS/g1/UDC
+
+	# See also: #338
+	# shellcheck disable=SC2005
+	echo "$(ls /sys/class/udc)" > $CONFIGFS/g1/UDC
 }
 
 setup_usb_network() {