[gnote] Fix compiler warning

[Aurimas Černius <aurimasc src gnome org>]

commit 490e59da9f728472f39e970fdf323322ae7a2c1e
Author: Aurimas Černius <aurisc4 gmail com>
Date:   Sun Sep 22 23:37:41 2019 +0300

    Fix compiler warning

 src/watchers.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/src/watchers.cpp b/src/watchers.cpp
index 848d6ba6..74ef0000 100644
--- a/src/watchers.cpp
+++ b/src/watchers.cpp
@@ -427,7 +427,7 @@ namespace gnote {
     }
   }
 
-  void NoteSpellChecker::language_changed(GspellChecker* self, GParamSpec *pspec, NoteSpellChecker *checker)
+  void NoteSpellChecker::language_changed(GspellChecker* self, GParamSpec*, NoteSpellChecker *checker)
   {
     try {
       const gchar *lang = gspell_language_get_code (gspell_checker_get_language (self));