related tdf#154946: check syntax in git pre-commit hook

Change-Id: If685f69227f98b194c124af0e28307d31edabf9c
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/150752
Tested-by: Jenkins
Reviewed-by: Xisco Fauli <xiscofauli@libreoffice.org>

.git-hooks/pre-commit

@@ -98,6 +98,10 @@ sub check_whitespaces($)
             {
                 bad_line("OOXMLEXPORT definition used in a ooxmlimport file", $_, "cxx");
             }
+            if ((/<toolbar:toolbaritem/) and not(/\/>/))
+            {
+                bad_line("Use /> to close toolbar:toolbaritem", $_, "xml");
+            }
             if (/<property name="use[-_]markup">True<\/property>/)
             {
                 bad_line("use font attributes instead of use-markup", $_, "ui");