btrfs: fix comment typos

Convert 'hepler' to 'helper'.
Signed-off-by: NLiu Bo <bo.li.liu@oracle.com>
Signed-off-by: NJiri Kosina <jkosina@suse.cz>

fs/btrfs/extent-tree.c

@@ -6482,7 +6482,7 @@ static noinline void reada_walk_down(struct btrfs_trans_handle *trans,
 }
 
 /*
- * hepler to process tree block while walking down the tree.
+ * helper to process tree block while walking down the tree.
  *
  * when wc->stage == UPDATE_BACKREF, this function updates
  * back refs for pointers in the block.
@@ -6557,7 +6557,7 @@ static noinline int walk_down_proc(struct btrfs_trans_handle *trans,
 }
 
 /*
- * hepler to process tree block pointer.
+ * helper to process tree block pointer.
  *
  * when wc->stage == DROP_REFERENCE, this function checks
  * reference count of the block pointed to. if the block
@@ -6695,7 +6695,7 @@ static noinline int do_walk_down(struct btrfs_trans_handle *trans,
 }
 
 /*
- * hepler to process tree block while walking up the tree.
+ * helper to process tree block while walking up the tree.
  *
  * when wc->stage == DROP_REFERENCE, this function drops
  * reference count on the block.

fs/btrfs/relocation.c

@@ -3474,7 +3474,7 @@ static int find_data_references(struct reloc_control *rc,
 }
 
 /*
- * hepler to find all tree blocks that reference a given data extent
+ * helper to find all tree blocks that reference a given data extent
  */
 static noinline_for_stack
 int add_data_references(struct reloc_control *rc,
@@ -3568,7 +3568,7 @@ int add_data_references(struct reloc_control *rc,
 }
 
 /*
- * hepler to find next unprocessed extent
+ * helper to find next unprocessed extent
  */
 static noinline_for_stack
 int find_next_extent(struct btrfs_trans_handle *trans,