fs: predict not having to do anything in fdput()

This matches the annotation in fdget().

Signed-off-by: Mateusz Guzik <mjguzik@gmail.com>
Link: https://lore.kernel.org/20250406235806.1637000-2-mjguzik@gmail.com
Signed-off-by: Christian Brauner <brauner@kernel.org>

Author: mjguzik

include/linux/file.h

@@ -59,7 +59,7 @@ static inline struct fd CLONED_FD(struct file *f)
 
 static inline void fdput(struct fd fd)
 {
-	if (fd.word & FDPUT_FPUT)
+	if (unlikely(fd.word & FDPUT_FPUT))
 		fput(fd_file(fd));
 }