Fix rollover inconsistencies.

Patch based on patch from Javier Fernández-Sanguino Peña.

Author: Chris Taylor <ctaylor@debian.org>

--- a/README
+++ b/README
@@ -8,7 +8,7 @@ This is a libpcap-based program.  It has
 
 1) It sniffs packets and spools them straight to the disk and can daemonize 
 itself for background packet logging.  By default the file rolls over when 
-1 GB of data is logged.
+2 GB of data is logged.
 
 2) It sniffs packets and rewrites them to a second interface, essentially 
 acting as a soft tap.  It can also do this in daemon mode.
--- a/daemonlogger.c
+++ b/daemonlogger.c
@@ -1221,7 +1221,7 @@ int parse_cmd_line(int argc, char *argv[
                     if(endptr == optarg)
                     {
                         fprintf(stderr, "Bad rollover size, defaulting to 2GB\n");
-                        rollsize = GIGABYTE;
+                        rollsize = 2*GIGABYTE;
                     }
                 }
                 else
