[PATCH] mtd-utils: flash_erase: Fix output of offsets

["Brian Norris" <computersforpeace@gmail.com>]

Need to use unsigned arithmetic and a 64-bit cast in order to
calculate and output the correct offset for eraseblocks at large
offsets. Signed integer arithmetic does not produce the correct
result "uint64_t" result, so for offsets over 2GB we get
messages like:

	Erasing 512 Kibyte @ ffffffff83180000 -- 4308642136 % complete.

Note that this error was not affecting proper erasure; it just
produced incorrect status messages.

Also, we should not add an extra eraseblock for the final status
message; this gives misleading output when, for example, the
following statement is executed:

	$ flash_erase /dev/mtd0 0 1
	Erasing 512 Kibyte @ 80000 -- 100 % complete

We aren't erasing at offset 0x80000; it should display offset 0.

Signed-off-by: Brian Norris <computersforpeace@gmail.com>
---
 flash_erase.c |    6 +++---
 1 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/flash_erase.c b/flash_erase.c
index 8929054..1a7b52e 100644
--- a/flash_erase.c
+++ b/flash_erase.c
@@ -93,7 +93,8 @@ int main(int argc, char *argv[])
 {
 	libmtd_t mtd_desc;
 	struct mtd_dev_info mtd;
-	int fd, clmpos = 0, clmlen = 8, eb, eb_start, eb_cnt;
+	int fd, clmpos = 0, clmlen = 8;
+	unsigned int eb, eb_start, eb_cnt;
 	int isNAND;
 	int error = 0;
 	uint64_t offset = 0;
@@ -232,7 +233,7 @@ int main(int argc, char *argv[])
 		eb_cnt = (mtd.size / mtd.eb_size) - eb_start;
 
 	for (eb = eb_start; eb < eb_start + eb_cnt; eb++) {
-		offset = eb * mtd.eb_size;
+		offset = (uint64_t)eb * mtd.eb_size;
 
 		if (!noskipbad) {
 			int ret = mtd_is_bad(&mtd, fd, eb);
@@ -285,7 +286,6 @@ int main(int argc, char *argv[])
 		}
 		verbose(!quiet, " Cleanmarker written at %"PRIx64, offset);
 	}
-	offset += mtd.eb_size;
 	show_progress(&mtd, offset, eb, eb_start, eb_cnt);
 	bareverbose(!quiet, "\n");
 
-- 
1.7.0.4