make get_file() return its argument

simplifies a bunch of callers...

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/include/linux/fs.h b/include/linux/fs.h
index aa11047..de1db1c 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -1074,7 +1074,11 @@
 	unsigned char f_handle[0];
 };
 
-#define get_file(x)	atomic_long_inc(&(x)->f_count)
+static inline struct file *get_file(struct file *f)
+{
+	atomic_long_inc(&f->f_count);
+	return f;
+}
 #define fput_atomic(x)	atomic_long_add_unless(&(x)->f_count, -1, 1)
 #define file_count(x)	atomic_long_read(&(x)->f_count)