Documentation/filesystems/files.txt: remove rcuref_inc_lf() reverences

rcuref_inc_lf() is not used anymore. Replace it by atomic_inc_not_zero()
Signed-off-by: NEric Dumazet <dada1@cosmosbay.com>
Signed-off-by: NAdrian Bunk <bunk@kernel.org>

Documentation/filesystems/files.txt

@@ -76,13 +76,13 @@ the fdtable structure -
 5. Handling of the file structures is special. Since the look-up
    of the fd (fget()/fget_light()) are lock-free, it is possible
    that look-up may race with the last put() operation on the
-   file structure. This is avoided using the rcuref APIs
+   file structure. This is avoided using atomic_inc_not_zero()
    on ->f_count :
 
 	rcu_read_lock();
 	file = fcheck_files(files, fd);
 	if (file) {
-		if (rcuref_inc_lf(&file->f_count))
+		if (atomic_inc_not_zero(&file->f_count))
 			*fput_needed = 1;
 		else
 		/* Didn't get the reference, someone's freed */
@@ -92,7 +92,7 @@ the fdtable structure -
 	....
 	return file;
 
-   rcuref_inc_lf() detects if refcounts is already zero or
+   atomic_inc_not_zero() detects if refcounts is already zero or
    goes to zero during increment. If it does, we fail
    fget()/fget_light().