files rcu optimization: Remove duplicated fget from fget_light.

The code for fget is contained in fget_light. So call fget
instead.

Signed-off-by: Christoph Lameter <clameter@sgi.com>

Index: linux-2.6.18-rc6-mm2/fs/file_table.c
===================================================================
--- linux-2.6.18-rc6-mm2.orig/fs/file_table.c	2006-09-12 21:03:48.943590374 -0500
+++ linux-2.6.18-rc6-mm2/fs/file_table.c	2006-09-12 21:04:03.584480438 -0500
@@ -233,16 +233,9 @@
 	if (likely((atomic_read(&files->count) == 1))) {
 		file = fcheck_files(files, fd);
 	} else {
-		rcu_read_lock();
-		file = fcheck_files(files, fd);
-		if (file) {
-			if (atomic_inc_not_zero(&file->f_count))
-				*fput_needed = 1;
-			else
-				/* Didn't get the reference, someone's freed */
-				file = NULL;
-		}
-		rcu_read_unlock();
+		file = fget(fd);
+		if (file)
+			*fput_needed = 1;
 	}
 
 	return file;