proc: make grab_header() static

Signed-off-by: Adrian Bunk <bunk@kernel.org>
Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>

fs/proc/proc_sysctl.c

@@ -66,7 +66,7 @@ static struct ctl_table *find_in_table(struct ctl_table *p, struct qstr *name)
 	return NULL;
 }
 
-struct ctl_table_header *grab_header(struct inode *inode)
+static struct ctl_table_header *grab_header(struct inode *inode)
 {
 	if (PROC_I(inode)->sysctl)
 		return sysctl_head_grab(PROC_I(inode)->sysctl);