stat: Pass namespace into phys_stat_dev_match, not mnt tree

This makes the API simpler.
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

include/mount.h

@@ -28,8 +28,8 @@ extern struct ns_desc mnt_ns_desc;
 
 extern dev_t phys_stat_resolve_dev(struct mount_info *tree,
 					dev_t st_dev, const char *path);
-extern bool phys_stat_dev_match(struct mount_info *tree, dev_t st_dev,
-					dev_t phys_dev, const char *path);
+extern bool phys_stat_dev_match(dev_t st_dev, dev_t phys_dev,
+		struct ns_id *, const char *path);
 
 struct pstree_item;
 extern int restore_task_mnt_ns(struct pstree_item *);

mount.c

@@ -207,13 +207,13 @@ dev_t phys_stat_resolve_dev(struct mount_info *tree,
 		MKKDEV(major(st_dev), minor(st_dev)) : m->s_dev;
 }
 
-bool phys_stat_dev_match(struct mount_info *tree, dev_t st_dev,
-				dev_t phys_dev, const char *path)
+bool phys_stat_dev_match(dev_t st_dev, dev_t phys_dev,
+		struct ns_id *ns, const char *path)
 {
 	if (st_dev == kdev_to_odev(phys_dev))
 		return true;
 
-	return phys_dev == phys_stat_resolve_dev(tree, st_dev, path);
+	return phys_dev == phys_stat_resolve_dev(ns->mnt.mntinfo_tree, st_dev, path);
 }
 
 /*

sk-unix.c

@@ -440,8 +440,8 @@ static int unix_collect_one(const struct unix_diag_msg *m,
 						name, m->udiag_ino);
 				drop_path = true;
 			} else if ((st.st_ino != uv->udiag_vfs_ino) ||
-			    !phys_stat_dev_match(ns->mnt.mntinfo_tree, st.st_dev,
-							uv->udiag_vfs_dev, name)) {
+					!phys_stat_dev_match(st.st_dev,
+						uv->udiag_vfs_dev, ns, name)) {
 				pr_info("unix: Dropping path %s for "
 						"unlinked bound "
 						"sk %#x.%#x real %#x.%#x\n",