bcache: fix typo 'succesfully' to 'successfully'

This patch fixes typo 'succesfully' to correct 'successfully', which is
suggested by checkpatch.pl.

Signed-off-by: Coly Li <colyli@suse.de>
Reviewed-by: Shenghui Wang <shhuiw@foxmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

drivers/md/bcache/io.c

@@ -86,7 +86,7 @@ void bch_count_io_errors(struct cache *ca,
 
 			/*
 			 * First we subtract refresh from count; each time we
-			 * succesfully do so, we rescale the errors once:
+			 * successfully do so, we rescale the errors once:
 			 */
 
 			count = atomic_cmpxchg(&ca->io_count, old, new);

drivers/md/bcache/request.c

@@ -154,7 +154,7 @@ static void bch_data_insert_error(struct closure *cl)
 
 	/*
 	 * Our data write just errored, which means we've got a bunch of keys to
-	 * insert that point to data that wasn't succesfully written.
+	 * insert that point to data that wasn't successfully written.
 	 *
 	 * We don't have to insert those keys but we still have to invalidate
 	 * that region of the cache - so, if we just strip off all the pointers