fs.h: fix outdated comment about file flags

The __dentry_open function was removed in
commit <2a027e7a18738>("fold __dentry_open() into its sole caller").

Signed-off-by: Li Qiang <[email protected]>
Signed-off-by: Al Viro <[email protected]>

Author: Li Qiang

include/linux/fs.h

@@ -94,7 +94,7 @@ typedef int (dio_iodone_t)(struct kiocb *iocb, loff_t offset,
 
 /*
  * flags in file.f_mode.  Note that FMODE_READ and FMODE_WRITE must correspond
- * to O_WRONLY and O_RDWR via the strange trick in __dentry_open()
+ * to O_WRONLY and O_RDWR via the strange trick in do_dentry_open()
  */
 
 /* file is open for reading */