dm cache: fix typos in comments

Fix up some typos in dm-cache comments.

Signed-off-by: Joe Thornber <[e-mail]>
Signed-off-by: Alasdair G Kergon <[e-mail]>

drivers/md/dm-cache-target.c

···
 	/*
 	 * writethrough fields.  These MUST remain at the end of this
 	 * structure and the 'cache' member must be the first as it
-	 * is used to determine the offsetof the writethrough fields.
+	 * is used to determine the offset of the writethrough fields.
 	 */
 	struct cache *cache;
 	dm_cblock_t cblock;
···
 	return r;
 }
 
- /*----------------------------------------------------------------*/
+/*----------------------------------------------------------------*/
 
 static bool is_dirty(struct cache *cache, dm_cblock_t b)
 {
···
 }
 
 /*----------------------------------------------------------------*/
+
 static bool block_size_is_power_of_two(struct cache *cache)
 {
 	return cache->sectors_per_block_shift >= 0;
···
 
 	/*
 	 * We can't issue this bio directly, since we're in interrupt
-	 * context.  So it get's put on a bio list for processing by the
+	 * context.  So it gets put on a bio list for processing by the
 	 * worker thread.
 	 */
 	defer_writethrough_bio(pb->cache, bio);