fs/char_dev.c: chrdev_open marked static and removed from fs.h

There is an outdated comment in serial_core.c also fixed.

Signed-off-by: Denis Cheng <crquan@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/fs/char_dev.c b/fs/char_dev.c
index 2c7a8b5..038674a 100644
--- a/fs/char_dev.c
+++ b/fs/char_dev.c
@@ -357,7 +357,7 @@
 /*
  * Called every time a character special file is opened
  */
-int chrdev_open(struct inode * inode, struct file * filp)
+static int chrdev_open(struct inode *inode, struct file *filp)
 {
 	struct cdev *p;
 	struct cdev *new = NULL;