(main): Don't assume size_t has the same width

as unsigned long.  Problem reported by Eric Blake.

1 files changed, 2 insertions, 1 deletions

diff --git a/src/dd.c b/src/dd.c
index c47249abb..0c65149b5 100644
--- a/src/dd.c
+++ b/src/dd.c
@@ -1652,13 +1652,14 @@ main (int argc, char **argv)
       if (seek_records != 0 && !(conversions_mask & C_NOTRUNC))
 	{
 	  uintmax_t size = seek_records * output_blocksize;
+	  unsigned long int obs = output_blocksize;
 
 	  if (OFF_T_MAX / output_blocksize < seek_records)
 	    error (EXIT_FAILURE, 0,
 		   _("offset too large: "
 		     "cannot truncate to a length of seek=%"PRIuMAX""
 		     " (%lu-byte) blocks"),
-		   seek_records, output_blocksize);
+		   seek_records, obs);
 
 	  if (ftruncate (STDOUT_FILENO, size) != 0)
 	    {