fix do_sys_open() prototype

Fix an argument name in do_sys_open()'s prototype.

Signed-off-by: Jason Uhlenkott <juhlenko@akamai.com>
Signed-off-by: Adrian Bunk <bunk@kernel.org>
diff --git a/include/linux/fs.h b/include/linux/fs.h
index 1657e99..1bcce66 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -1536,7 +1536,7 @@
 
 extern int do_truncate(struct dentry *, loff_t start, unsigned int time_attrs,
 		       struct file *filp);
-extern long do_sys_open(int fdf, const char __user *filename, int flags,
+extern long do_sys_open(int dfd, const char __user *filename, int flags,
 			int mode);
 extern struct file *filp_open(const char *, int, int);
 extern struct file * dentry_open(struct dentry *, struct vfsmount *, int);