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mkinitfs: make sure that we return to original dir

--- a/mkinitfs.in

+++ b/mkinitfs.in

@@ -40,6 +40,7 @@

 	done

 	mkdir -p $dirs

+	local oldpwd="$PWD"

 	cd "${basedir:-/}"

 	for file in $(feature_files files); do

 		echo $file

@@ -51,6 +52,7 @@

 	for i in "$fstab" "$passwd" "$group"; do

 		install -Dm644 "$i" "$tmpdir"/etc/${i##*/} || return 1

 	done

+	cd "$oldpwd"

 }

 find_kmod_deps() {

@@ -89,6 +91,7 @@

 }

 find_kmods() {

+	local oldpwd="$PWD"

 	cd "$kerneldir" || return 1

 	for file in $(feature_files modules); do

 		if ! [ -e ${file} ]; then

@@ -97,6 +100,7 @@

 		fi

 		echo $file

 	done | find_kmod_deps

+	cd "$oldpwd"

 }

 initfs_kmods() {

@@ -107,11 +111,13 @@

 		depmod -b "${basedir:-/}" $kernel

 	fi

 	files=$(find_kmods)

+	local oldpwd="$PWD"

 	cd ${basedir:-/}

 	for file in $files; do

 		echo $file

 	done | cpio -pdm "$tmpdir"

 	depmod $kernel -b "$tmpdir"

+	cd "$oldpwd"

 }

 initfs_apk_keys() {