Make the buffer for formatting the SCAN.DS test value in an OS fingerprint a

little bit bigger, so some seriously wrong distances aren't truncated. The
buffer size used to be 8, which couldn't hold an observed network distance of
-190:
	%DS=-19\0
	01234567
I increased it to 10.

osscan.cc

@@ -462,7 +462,7 @@ static void WriteSInfo(char *ostr, int ostrlen, bool isGoodFP,
 				int openTcpPort, int closedTcpPort, int closedUdpPort) {
   struct tm *ltime;
   time_t timep;
-  char dsbuf[8], otbuf[8], ctbuf[8], cubuf[8];
+  char dsbuf[10], otbuf[8], ctbuf[8], cubuf[8];
   char macbuf[16];
   timep = time(NULL);
   ltime = localtime(&timep);