[Tools] winetest/build-errors: Fix updating the errors.html file.

[Francois Gouget]

build-errors expects the $filename variable to be set so it can use it
to move the new file into place.

Signed-off-by: Francois Gouget <fgouget at codeweavers.com>
---
 winetest/build-errors | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/winetest/build-errors b/winetest/build-errors
index f9ac4aa6..2d25ae3f 100755
--- a/winetest/build-errors
+++ b/winetest/build-errors
@@ -80,7 +80,8 @@ foreach my $dir (readdir DIR)
 }
 closedir DIR;
 
-open OUT, ">data/errors.html.new" or die "cannot create 'data/errors.html.new'";
+my $filename = "data/errors.html";
+open OUT, ">$filename.new" or die "cannot create 'data/$filename.new'";
 
 print OUT start_html( -title => "Errors caught during Wine test report processing",
                       -style => {src => "/summary.css"},
-- 
2.11.0