Hello,

Harald found a testcase with memory still leaking despite my previous 
patch for PR108923.
That patch was fixing a leak caused by absence of memory release, the 
attached patch fixes a leak caused by pointer overwrite.

I haven't investigated why sort_actual is called several times( which 
causes the memory leak) nor tried to avoid that.  Theoretically, one 
could assert that the previous associated_dummy value is the same as the 
one to be written (it should be the same at each sort_actual 
invocation), but I have preferred to silently overwrite, and fix just 
the memory problem.

Manually tested on Harald's testcase (predcom-1.f) and ran the full 
fortran testsuite on x86_64-pc-linux-gnu.

OK for master and 12 and 11?