Don't print empty synopses of functions.

diff --git a/doc/kernel-doc b/doc/kernel-doc
index 14aa37fbcbe23e907ce0e281e1ace6dae45f3348..e3272fcf5ef0a29d392834d7bb82029fb3bf6468 100755 (executable)
--- a/doc/kernel-doc
+++ b/doc/kernel-doc
@@ -544,7 +544,7 @@ sub output_bird {
        }
     }
     print ")";
-    if (defined $args{'purpose'}) {
+    if ($args{'purpose'} ne "") {
        print " -- ";
        output_highlight($args{'purpose'});
     }