powerpc: Use sizeof(*foo) rather than sizeof(struct foo)

It's slightly less error prone to use sizeof(*foo) rather than
specifying the type.

Signed-off-by: Markus Elfring <elfring@users.sourceforge.net>
[mpe: Consolidate into one patch, rewrite change log]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

arch/powerpc/kernel/nvram_64.c

@@ -207,8 +207,7 @@ int nvram_write_os_partition(struct nvram_os_partition *part,
 
 	tmp_index = part->index;
 
-	rc = ppc_md.nvram_write((char *)&info, sizeof(struct err_log_info),
-				&tmp_index);
+	rc = ppc_md.nvram_write((char *)&info, sizeof(info), &tmp_index);
 	if (rc <= 0) {
 		pr_err("%s: Failed nvram_write (%d)\n", __func__, rc);
 		return rc;
@@ -244,9 +243,7 @@ int nvram_read_partition(struct nvram_os_partition *part, char *buff,
 	tmp_index = part->index;
 
 	if (part->os_partition) {
-		rc = ppc_md.nvram_read((char *)&info,
-					sizeof(struct err_log_info),
-					&tmp_index);
+		rc = ppc_md.nvram_read((char *)&info, sizeof(info), &tmp_index);
 		if (rc <= 0) {
 			pr_err("%s: Failed nvram_read (%d)\n", __func__, rc);
 			return rc;
@@ -1173,7 +1170,7 @@ int __init nvram_scan_partitions(void)
 			       "detected: 0-length partition\n");
 			goto out;
 		}
-		tmp_part = kmalloc(sizeof(struct nvram_partition), GFP_KERNEL);
+		tmp_part = kmalloc(sizeof(*tmp_part), GFP_KERNEL);
 		err = -ENOMEM;
 		if (!tmp_part) {
 			printk(KERN_ERR "nvram_scan_partitions: kmalloc failed\n");