cgi: avoid warning after exec

Found with mod_perl2 (as it overrides exit).

1 files changed, 1 insertions, 2 deletions

diff --git a/public-inbox.cgi b/public-inbox.cgi
index da87d2c3..56040676 100755
--- a/public-inbox.cgi
+++ b/public-inbox.cgi
@@ -155,8 +155,7 @@ sub mid2blob {
         defined $pid or die "fork failed: $!\n";
         if ($pid == 0) {
                 open STDERR, '>', '/dev/null'; # ignore errors
-                exec @cmd;
-                exit 1;
+                exec @cmd or die "exec failed: $!\n";
         } else {
                 my $blob = eval { local $/; <$fh> };
                 close $fh;