[PATCH 1/2] extmsg: search_partial: use ->isrch if available

[Eric Wong <e@80x24.org>]

This allows us to avoid creating ibx->{search}->{xdb} at this
spot by using an `undef' value.  This is a step towards
eliminating the innocuous "/path/to/inboxdir/xap15 has no shards"
messages introduced in commit 63d7b8ce (daemons: revamp
periodic cleanup task, 2021-09-23)
---
 lib/PublicInbox/ExtMsg.pm | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/PublicInbox/ExtMsg.pm b/lib/PublicInbox/ExtMsg.pm
index b7427b1b..c134de55 100644
--- a/lib/PublicInbox/ExtMsg.pm
+++ b/lib/PublicInbox/ExtMsg.pm
@@ -32,7 +32,7 @@ sub PARTIAL_MAX () { 100 }
 sub search_partial ($$) {
 	my ($ibx, $mid) = @_;
 	return if length($mid) < $MIN_PARTIAL_LEN;
-	my $srch = $ibx->search or return; # NOT ->isrch, we already try ->ALL
+	my $srch = $ibx->isrch or return;
 	my $opt = { limit => PARTIAL_MAX, relevance => -1 };
 	my @try = ("m:$mid*");
 	my $chop = $mid;