fs: Remove unlikely() from fget_light()

There's an unlikely() in fget_light() that assumes the file ref count
will be 1. Running the annotate branch profiler on a desktop that is
performing daily tasks (running firefox, evolution, xchat and is also part
of a distcc farm), it shows that the ref count is not 1 that often.

 correct incorrect      %    Function                  File              Line
 ------- ---------      -    --------                  ----              ----
1035099358 6209599193  85    fget_light              file_table.c         315

Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Christoph Hellwig <hch@lst.de>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

fs/file_table.c

@@ -311,7 +311,7 @@ struct file *fget_light(unsigned int fd, int *fput_needed)
 	struct files_struct *files = current->files;
 
 	*fput_needed = 0;
-	if (likely((atomic_read(&files->count) == 1))) {
+	if (atomic_read(&files->count) == 1) {
 		file = fcheck_files(files, fd);
 	} else {
 		rcu_read_lock();