usergen: Fix error on empty $QUOTA

When no quota is entered, printf(1) could fail because '%d' would expect
at least one argument. Whereas some printf(1) implementations, such as
the one by GNU coreutils, are somewhat tolerant, stricter
implementations such as Busybox would (correctly) refuse this.

1 files changed, 1 insertions, 1 deletions

diff --git a/usergen b/usergen
index e59b44d..eac072b 100755
--- a/usergen
+++ b/usergen
@@ -59,7 +59,7 @@ echo
 
 echo "Quota, in MiB (leave empty for unlimited quota):" >&2
 read -r QUOTA
-QUOTA="$(printf '%d' "$QUOTA")"
+QUOTA="${QUOTA:+"$(printf '%d' "$QUOTA")"}"
 
 PWD=$(printf '%s' "$PWD" | to_hex)
 SALT=$(openssl rand -hex 32)