Fix irc message for multiple bugs found

This commit is basically the dual of change:
Iaf28dbe9909c60b1e2206a79faaf5190f792252d which fixed the gerrit
message when multiple bugs were identified. This just does the same
thing for the irc messages too, which were overlooked in the other
patch.

Change-Id: Ic446d9a1568b4b017455f85ce78b192910904b47