scripts/documentation-file-ref-check: improve tools ref handling

There's a false positive on perf/util:

	tools/perf/util/s390-cpumsf.c: Documentation/perf.data-file-format.txt

The file is there at tools/perf/Documentation/, but the logic
with detects relative documentation references inside tools is
not capable of detecting it.

So, improve it.

Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>

diff --git a/scripts/documentation-file-ref-check b/scripts/documentation-file-ref-check
index 0523577..5d775ca 100755 (executable)
--- a/scripts/documentation-file-ref-check
+++ b/scripts/documentation-file-ref-check
@@ -127,7 +127,7 @@ while (<IN>) {
                if ($f =~ m/tools/) {
                        my $path = $f;
                        $path =~ s,(.*)/.*,$1,;
-                       next if (grep -e, glob("$path/$ref $path/$fulref"));
+                       next if (grep -e, glob("$path/$ref $path/../$ref $path/$fulref"));
                }
 
                # Discard known false-positives