[patch, libgfortran] PR24584 Segfault on null string in namelist input file

[Jerry DeLisle]

I will commit the following patch and test case attached as obvious this evening 
unless there are objections.  (Reviewed with Paul Thomas off list)

Regards,

Jerry

Index: list_read.c
===================================================================
--- list_read.c	(revision 106012)
+++ list_read.c	(working copy)
@@ -134,6 +134,7 @@
      free_mem (saved_string);

    saved_string = NULL;
+  saved_used = 0;
  }

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