wt-status.c: make wt_status_check_rebase() work on any worktree

This is a preparation step for find_shared_symref() to detect if any
worktree is being rebased.

Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
diff --git a/wt-status.h b/wt-status.h
index b398353..c4ddcad 100644
--- a/wt-status.h
+++ b/wt-status.h
@@ -6,6 +6,8 @@
 #include "color.h"
 #include "pathspec.h"
 
+struct worktree;
+
 enum color_wt_status {
 	WT_STATUS_HEADER = 0,
 	WT_STATUS_UPDATED,
@@ -100,7 +102,8 @@
 void wt_status_print(struct wt_status *s);
 void wt_status_collect(struct wt_status *s);
 void wt_status_get_state(struct wt_status_state *state, int get_detached_from);
-int wt_status_check_rebase(struct wt_status_state *state);
+int wt_status_check_rebase(const struct worktree *wt,
+			   struct wt_status_state *state);
 
 void wt_shortstatus_print(struct wt_status *s);
 void wt_porcelain_print(struct wt_status *s);