staging: erofs: Replace kzalloc(struct ..) with kzalloc(*ptr)

Resolve checkpatch warning:
Prefer kzalloc(sizeof(*ptr)...) over kzalloc(sizeof(struct ..)
Signed-off-by: Shobhit Kukreti <shobhitkukreti@gmail.com>
Reviewed-by: Chao Yu <yuchao0@huawei.com>
Reviewed-by: Gao Xiang <gaoxiang25@huawei.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/erofs/super.c

@@ -383,7 +383,7 @@ static int erofs_read_super(struct super_block *sb,
 		goto err;
 	}
 
-	sbi = kzalloc(sizeof(struct erofs_sb_info), GFP_KERNEL);
+	sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
 	if (unlikely(!sbi)) {
 		err = -ENOMEM;
 		goto err;

drivers/staging/erofs/unzip_vle.c

@@ -1263,8 +1263,7 @@ jobqueue_init(struct super_block *sb,
 		goto out;
 	}
 
-	iosb = kvzalloc(sizeof(struct z_erofs_vle_unzip_io_sb),
-			GFP_KERNEL | __GFP_NOFAIL);
+	iosb = kvzalloc(sizeof(*iosb), GFP_KERNEL | __GFP_NOFAIL);
 	DBG_BUGON(!iosb);
 
 	/* initialize fields in the allocated descriptor */