target: tcm_loop: Improve a size determination in two functions

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

This issue was detected by using the Coccinelle software.
Signed-off-by: Markus Elfring <elfring@users.sourceforge.net>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>

drivers/target/loopback/tcm_loop.c

@@ -769,7 +769,7 @@ static int tcm_loop_make_nexus(
 		return -EEXIST;
 	}
 
-	tl_nexus = kzalloc(sizeof(struct tcm_loop_nexus), GFP_KERNEL);
+	tl_nexus = kzalloc(sizeof(*tl_nexus), GFP_KERNEL);
 	if (!tl_nexus)
 		return -ENOMEM;
 
@@ -1076,7 +1076,7 @@ static struct se_wwn *tcm_loop_make_scsi_hba(
 	char *ptr;
 	int ret, off = 0;
 
-	tl_hba = kzalloc(sizeof(struct tcm_loop_hba), GFP_KERNEL);
+	tl_hba = kzalloc(sizeof(*tl_hba), GFP_KERNEL);
 	if (!tl_hba)
 		return ERR_PTR(-ENOMEM);