btrfs: drop default value assignments in enums

A few more instances whre we don't need to specify the values as long as
they are the same that enum assigns automatically. All of the enums are
in-memory only and nothing relies on the exact values.
Signed-off-by: David Sterba <dsterba@suse.com>

fs/btrfs/extent-tree.c

@@ -46,9 +46,9 @@
  *
  */
 enum {
-	CHUNK_ALLOC_NO_FORCE = 0,
-	CHUNK_ALLOC_LIMITED = 1,
-	CHUNK_ALLOC_FORCE = 2,
+	CHUNK_ALLOC_NO_FORCE,
+	CHUNK_ALLOC_LIMITED,
+	CHUNK_ALLOC_FORCE,
 };
 
 /*
@@ -7302,10 +7302,10 @@ wait_block_group_cache_done(struct btrfs_block_group_cache *cache)
 }
 
 enum btrfs_loop_type {
-	LOOP_CACHING_NOWAIT = 0,
-	LOOP_CACHING_WAIT = 1,
-	LOOP_ALLOC_CHUNK = 2,
-	LOOP_NO_EMPTY_SIZE = 3,
+	LOOP_CACHING_NOWAIT,
+	LOOP_CACHING_WAIT,
+	LOOP_ALLOC_CHUNK,
+	LOOP_NO_EMPTY_SIZE,
 };
 
 static inline void

fs/btrfs/file.c

@@ -2796,9 +2796,9 @@ static int btrfs_fallocate_update_isize(struct inode *inode,
 }
 
 enum {
-	RANGE_BOUNDARY_WRITTEN_EXTENT = 0,
-	RANGE_BOUNDARY_PREALLOC_EXTENT = 1,
-	RANGE_BOUNDARY_HOLE = 2,
+	RANGE_BOUNDARY_WRITTEN_EXTENT,
+	RANGE_BOUNDARY_PREALLOC_EXTENT,
+	RANGE_BOUNDARY_HOLE,
 };
 
 static int btrfs_zero_range_check_range_boundary(struct inode *inode,