amavisdlogsumm divide by zero patch.

[Bill Campbell]

I ran into a divide-by-zero problem this morning when running
the amavisd log summary problem, with the attached patch fixes.

Bill
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--- amavislogsumm-0.6   2005-08-17 08:14:33.000000000 -0700
+++ /tmp/amavislogsumm  2006-01-03 09:13:03.827429145 -0800
@@ -1,4 +1,4 @@
-#!/usr/bin/perl
+#!/csrel22/bin/perl
 
 #
 # amavislogsumm - analyse amavisd-new logfiles. Read from STDIN
@@ -309,7 +309,7 @@
     if ($spamCount > 0) {
         printf "\tSPAM : %5.2f\n", ($spamHitSum / $spamCount); 
     }
-    if (($timeLineCount - $spamCount) > 0) { 
+    if (($timeLineCount - $spamCount - $unscoredMail) > 0) { 
         printf "\tHAM  : %5.2f\n", ($noneSpamHitSum / ($timeLineCount - 
$spamCount - $unscoredMail)); 
         print "\n";
     }