[tools] testbot/TestWTBS: Don't report failed test unit matches twice.

[Francois Gouget]

If a module:unit entry did not match, it's certainly not going to match
as a module name.

Signed-off-by: Francois Gouget 
---
This issue was found thanks to the testwtbsuite test suite.
---
 testbot/tests/TestWTBS | 1 +
 1 file changed, 1 insertion(+)

diff --git a/testbot/tests/TestWTBS b/testbot/tests/TestWTBS
index e3b0a3ce6..2a6b66e6d 100755
--- a/testbot/tests/TestWTBS
+++ b/testbot/tests/TestWTBS
@@ -1209,6 +1209,7 @@ sub CheckJobTree($;$)
             }
             fail("Check that $MissionType VMs ran $TestGrep for job $JobId")
                 or diag("TestUnits=", join(" ", sort keys %{$TestUnits->{$MissionType}}));
+            next;
           }
           my $Matched;
           foreach my $TestUnit (keys %{$TestUnits->{$MissionType}})