base-files/functions.sh: use command -v instead of which

which must be executed. command -v is a shell builtin.

https://github.com/koalaman/shellcheck/wiki/SC2230

Signed-off-by: Rosen Penev <rosenp@gmail.com>

package/base-files/files/lib/functions.sh

@@ -176,7 +176,7 @@ default_prerm() {
 		ret=$?
 	fi
 
-	local shell="$(which bash)"
+	local shell="$(command -v bash)"
 	for i in $(grep -s "^/etc/init.d/" "$root/usr/lib/opkg/info/${pkgname}.list"); do
 		if [ -n "$root" ]; then
 			${shell:-/bin/sh} "$root/etc/rc.common" "$root$i" disable
@@ -264,7 +264,7 @@ default_postinst() {
 		rm -f /tmp/luci-indexcache
 	fi
 
-	local shell="$(which bash)"
+	local shell="$(command -v bash)"
 	for i in $(grep -s "^/etc/init.d/" "$root$filelist"); do
 		if [ -n "$root" ]; then
 			${shell:-/bin/sh} "$root/etc/rc.common" "$root$i" enable