Use of const for some functions returning "char *"

src/plugins/fifo/fifo-info.c

@@ -29,7 +29,7 @@
  * fifo_info_get_info_cb: callback called when fifo info is asked
  */
 
-char *
+const char *
 fifo_info_get_info_cb (void *data, const char *info_name,
                        const char *arguments)
 {

src/plugins/fifo/fifo.c

@@ -58,7 +58,7 @@ int
 fifo_create ()
 {
     int rc, filename_length;
-    char *fifo_option, *weechat_home;
+    const char *fifo_option, *weechat_home;
     
     rc = 0;