Code review comment for ~dirk.zimoch/epics-base:FilterForInfoFields

With the current 7.0 head, the function dbGet() in dbAccess.c branches 3 times on a test of dbfl_has_copy().

With a dummy dtor, the program flow it takes the else path all three times.
Without a dtor, it takes the first else path but the other two times it takes the if path.

In the old version of dbAccess.c, it took the else path all three times.