Ensure that the com_rules[] array entries are initialized to NULL in

case individual entries aren't used, but dynamic rules are enabled
(i.e., at least one or more of them are not NULL, meaning that they'll
all be assumed to be either NULL or a valid value).

This commit was SVN r23361.

ompi/mca/coll/tuned/coll_tuned_module.c

@@ -146,6 +146,7 @@ ompi_coll_tuned_forced_getvalues( enum COLLTYPE type,
     {                                                                   \
         int need_dynamic_decision = 0;                                  \
         ompi_coll_tuned_forced_getvalues( (TYPE), &((DATA)->user_forced[(TYPE)]) ); \
+        (DATA)->com_rules[(TYPE)] = NULL;                               \
         if( 0 != (DATA)->user_forced[(TYPE)].algorithm ) {              \
             need_dynamic_decision = 1;                                  \
             EXECUTE;                                                    \