Make shellcheck happy

I would not expect this to ever fail, but quoting the specific
invocation of id -u here silences the only shellcheck warning.

1 files changed, 1 insertions, 1 deletions

diff --git a/bosun b/bosun
index 49ba22c..6240029 100755
--- a/bosun
+++ b/bosun
@@ -4,7 +4,7 @@
 export STOW_DIR=${STOW_DIR:-/etc/portage/stow}
 
 need_root() {
-	if test $(id -u) -ne 0; then
+	if test "$(id -u)" -ne 0; then
 		printf 'This action requires superuser access.\n'
 		exit 1
 	fi