Negative bits xfered because of int overflow when xfer > 2 Gbytes/sec.

[reubenhwk]

diff --git a/src/ReportDefault.c b/src/ReportDefault.c
index 52f781a..d10f87f 100644
--- a/src/ReportDefault.c
+++ b/src/ReportDefault.c
@@ -70,7 +70,7 @@ extern "C" {
  */
 void reporter_printstats( Transfer_Info *stats ) {
     static char header_printed = 0;
-    int bytesxfered;
+    umax_size_t bytesxfered;
 
     byte_snprintf( buffer, sizeof(buffer)/2, (double) stats->TotalLen,
                    toupper( (int)stats->mFormat));