dma-buf: Remove unneeded stubs around sync_debug interfaces

The sync_debug.h header is internal, and only used by
sw_sync.c. Therefore, SW_SYNC is always defined and there
is no need for the stubs. Remove them and make the code
simpler.
Signed-off-by: Ezequiel Garcia <ezequiel@collabora.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/20180504180037.10661-1-ezequiel@collabora.com

drivers/dma-buf/sync_debug.h

@@ -62,8 +62,6 @@ struct sync_pt {
 	struct rb_node node;
 };
 
-#ifdef CONFIG_SW_SYNC
-
 extern const struct file_operations sw_sync_debugfs_fops;
 
 void sync_timeline_debug_add(struct sync_timeline *obj);
@@ -72,12 +70,4 @@ void sync_file_debug_add(struct sync_file *fence);
 void sync_file_debug_remove(struct sync_file *fence);
 void sync_dump(void);
 
-#else
-# define sync_timeline_debug_add(obj)
-# define sync_timeline_debug_remove(obj)
-# define sync_file_debug_add(fence)
-# define sync_file_debug_remove(fence)
-# define sync_dump()
-#endif
-
 #endif /* _LINUX_SYNC_H */