This test previously generated a warning because the function did not return
a value when the return type was specified.  However, the point of the test was
a valgrind error that still exists when no return type is specified.  I decided
to remove the specified return type.  This program will now complete with only
the valgrind error remaining.
These five tests were properly checking that we detect when a function fails to
return a value, so it was appropriate to alter them for an error rather than a
warning with output.