sysfs: make sysfs_alloc_ino() static

sysfs_alloc_ino() isn't used out side of fs/sysfs/dir.c.  Make it
static.
Signed-off-by: Tejun Heo <htejun@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

fs/sysfs/dir.c

@@ -20,7 +20,7 @@ spinlock_t kobj_sysfs_assoc_lock = SPIN_LOCK_UNLOCKED;
 static spinlock_t sysfs_ino_lock = SPIN_LOCK_UNLOCKED;
 static DEFINE_IDA(sysfs_ino_ida);
 
-int sysfs_alloc_ino(ino_t *pino)
+static int sysfs_alloc_ino(ino_t *pino)
 {
 	int ino, rc;