dlm: Improve a size determination in table_seq_start()

Replace the specification of a data structure by a pointer dereference
as the parameter for the operator "sizeof" to make the corresponding size
determination a bit safer according to the Linux coding style convention.

Signed-off-by: Markus Elfring <[e-mail]>
Signed-off-by: David Teigland <[e-mail]>

fs/dlm/debug_fs.c

···
 	if (bucket >= ls->ls_rsbtbl_size)
 		return NULL;
 
-	ri = kzalloc(sizeof(struct rsbtbl_iter), GFP_NOFS);
+	ri = kzalloc(sizeof(*ri), GFP_NOFS);
 	if (!ri)
 		return NULL;
 	if (n == 0)