spawn: which: allow embedded slash for relative path

This makes the subroutine behave more like which(1) command
and will make using spawn() in tests easier.

1 files changed, 1 insertions, 1 deletions

diff --git a/lib/PublicInbox/Spawn.pm b/lib/PublicInbox/Spawn.pm
index e2868a55..b946a663 100644
--- a/lib/PublicInbox/Spawn.pm
+++ b/lib/PublicInbox/Spawn.pm
@@ -178,7 +178,7 @@ unless (defined $vfork_spawn) {
 
 sub which ($) {
         my ($file) = @_;
-        return $file if index($file, '/') == 0;
+        return $file if index($file, '/') >= 0;
         foreach my $p (split(':', $ENV{PATH})) {
                 $p .= "/$file";
                 return $p if -x $p;