remove bashism

Signed-off-by: Thomas Sjögren <konstruktoid@users.noreply.github.com>

hack/install.sh

@@ -187,7 +187,7 @@ do_install() {
 			# install apparmor utils if they're missing and apparmor is enabled in the kernel
 			# otherwise Docker will fail to start
 			if [ "$(cat /sys/module/apparmor/parameters/enabled 2>/dev/null)" = 'Y' ]; then
-				if command -v apparmor_parser &> /dev/null; then
+				if command -v apparmor_parser >/dev/null 2>&1; then
 					echo 'apparmor is enabled in the kernel and apparmor utils were already installed'
 				else
 					echo 'apparmor is enabled in the kernel, but apparmor_parser missing'