Fixed Multi_Dimensional_Array6 regression test

Author: esteffin

Diff for: regression/cbmc/Multi_Dimensional_Array6/test.desc

@@ -5,6 +5,6 @@ main.c
 ^SIGNAL=0$
 ^\[main\.assertion\.1\] .*: SUCCESS$
 ^\[main\.assertion\.2\] .*: FAILURE$
-^\*\* 5 of \d+ failed
+^\*\* 3 of \d+ failed
 --
 ^warning: ignoring