tools: kwbimage: Add support for dumping NAND_BLKSZ for v0 images

In Dove functional specification, which use kwbimage v0, is also defined
nand block size field. So dump NAND_BLKSZ also for v0 images.

In Kirkwood functional specification, which also use kwbimage v0, this
field is not defined. So when it is zero and Kirkwood is detected, do not
dump it.

Fixes: f76ae2571fe0 ("tools: kwbimage: Add support for dumping extended and binary v0 headers")
Signed-off-by: Pali Rohár <pali@kernel.org>
diff --git a/tools/kwbimage.c b/tools/kwbimage.c
index 0c3b40d..eb99ac9 100644
--- a/tools/kwbimage.c
+++ b/tools/kwbimage.c
@@ -2185,7 +2185,7 @@
 	if (mhdr->blockid == IBR_HDR_NAND_ID)
 		fprintf(f, "NAND_PAGE_SIZE 0x%x\n", (unsigned)le16_to_cpu(mhdr->nandpagesize));
 
-	if (version != 0 && mhdr->blockid == IBR_HDR_NAND_ID) {
+	if (mhdr->blockid == IBR_HDR_NAND_ID && (version != 0 || is_v0_ext || mhdr->nandblocksize != 0)) {
 		if (mhdr->nandblocksize != 0) /* block size explicitly set in 64 kB unit */
 			fprintf(f, "NAND_BLKSZ 0x%x\n", (unsigned)mhdr->nandblocksize * 64*1024);
 		else if (le16_to_cpu(mhdr->nandpagesize) > 512)