readelf: Clean up section lists after usage.

Signed-off-by: Mark Wielaard <mark@klomp.org>
diff --git a/src/ChangeLog b/src/ChangeLog
index ae13793..0c817f4 100644
--- a/src/ChangeLog
+++ b/src/ChangeLog
@@ -1,3 +1,8 @@
+2019-05-09  Mark Wielaard  <mark@klomp.org>
+
+	* readelf.c (cleanup_list): New function.
+	(main): Call cleanup_list for dump_data_sections and string_sections.
+
 2019-04-28  Mark Wielaard  <mark@klomp.org>
 
 	* unstrip.c (add_new_section_symbols): Call ELF_CHECK after
diff --git a/src/readelf.c b/src/readelf.c
index c346e1f..4c20c38 100644
--- a/src/readelf.c
+++ b/src/readelf.c
@@ -312,6 +312,17 @@
 static char *yes_str;
 static char *no_str;
 
+static void
+cleanup_list (struct section_argument *list)
+{
+  while (list != NULL)
+    {
+      struct section_argument *a = list;
+      list = a->next;
+      free (a);
+    }
+}
+
 int
 main (int argc, char *argv[])
 {
@@ -353,6 +364,9 @@
     }
   while (++remaining < argc);
 
+  cleanup_list (dump_data_sections);
+  cleanup_list (string_sections);
+
   return error_message_count != 0;
 }