WMaker: fix memory leak in the root menu parser (Coverity #50122)

As pointed by Coverity, if the word "WITH" was used in the content of the
root menu definition then its string would not be freed.

Signed-off-by: Christophe CURIS <christophe.curis@free.fr>

src/rootmenu.c

@@ -571,6 +571,7 @@ static void separateCommand(char *line, char ***file, char **command)
 					*command = wstrdup(tmp);
 				else
 					wwarning(_("%s: missing command"), line);
+				wfree(token);
 				break;
 			}
 			WMAddToArray(array, token);