public-inbox-index: exit with usage if not given an arg

I often forget how to use this myself :x

1 files changed, 5 insertions, 5 deletions

diff --git a/public-inbox-index b/public-inbox-index
index 2fcf5627..1104bbc8 100755
--- a/public-inbox-index
+++ b/public-inbox-index
@@ -17,11 +17,11 @@ if ($@) {
 }
 
 sub usage { print STDERR "Usage: $usage\n"; exit 1 }
-if (@ARGV) {
-        foreach my $dir (@ARGV) {
-                index_dir($dir);
-        }
-};
+usage() unless @ARGV;
+
+foreach my $dir (@ARGV) {
+        index_dir($dir);
+}
 
 sub index_dir {
         my ($git_dir) = @_;