cgroup: relocate cgroup_[try]get/put()

Relocate cgroup_get(), cgroup_tryget() and cgroup_put() upwards.  This
is pure code reorganization to prepare for future changes.
Signed-off-by: NTejun Heo <tj@kernel.org>

kernel/cgroup.c

@@ -428,6 +428,22 @@ static inline bool cgroup_is_dead(const struct cgroup *cgrp)
 	return !(cgrp->self.flags & CSS_ONLINE);
 }
 
+static void cgroup_get(struct cgroup *cgrp)
+{
+	WARN_ON_ONCE(cgroup_is_dead(cgrp));
+	css_get(&cgrp->self);
+}
+
+static bool cgroup_tryget(struct cgroup *cgrp)
+{
+	return css_tryget(&cgrp->self);
+}
+
+static void cgroup_put(struct cgroup *cgrp)
+{
+	css_put(&cgrp->self);
+}
+
 struct cgroup_subsys_state *of_css(struct kernfs_open_file *of)
 {
 	struct cgroup *cgrp = of->kn->parent->priv;
@@ -1177,22 +1193,6 @@ static umode_t cgroup_file_mode(const struct cftype *cft)
 	return mode;
 }
 
-static void cgroup_get(struct cgroup *cgrp)
-{
-	WARN_ON_ONCE(cgroup_is_dead(cgrp));
-	css_get(&cgrp->self);
-}
-
-static bool cgroup_tryget(struct cgroup *cgrp)
-{
-	return css_tryget(&cgrp->self);
-}
-
-static void cgroup_put(struct cgroup *cgrp)
-{
-	css_put(&cgrp->self);
-}
-
 /**
  * cgroup_calc_child_subsys_mask - calculate child_subsys_mask
  * @cgrp: the target cgroup