[PATCH] viewdiff: fix parts of diff being appended after signature

[PATCH] viewdiff: fix parts of diff being appended after signature

[Eric Wong]

I'm not sure what kind of brain fart introduced this in
c1e7a048be9d32cd, but it happened :x.  We'll undef the $x
variable ASAP to save memory and make future errors like this
one more noticeable.

Fixes: c1e7a048be9d ("www: viewdiff: fix UTF-8 names inside mbox attachments")
---
 lib/PublicInbox/ViewDiff.pm | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/lib/PublicInbox/ViewDiff.pm b/lib/PublicInbox/ViewDiff.pm
index 95bbf2d2..124a723a 100644
--- a/lib/PublicInbox/ViewDiff.pm
+++ b/lib/PublicInbox/ViewDiff.pm
@@ -212,8 +212,9 @@ sub flush_diff ($$) {
 			for my $s (split(/((?:(?:^\+[^\n]*\n)+)|
 					(?:(?:^-[^\n]*\n)+)|
 					(?:^@@ [^\n]+\n))/xsm, $x)) {
+				undef $x;
 				if (!defined($dctx)) {
-					print $afh $x;
+					print $afh $s;
 				} elsif ($s =~ s/\A@@ (\S+) (\S+) @@//) {
 					print $zfh qq(<span\nclass="hunk">),
 						diff_hunk($dctx, $1, $2),