[binutils-gdb] [gdb/testsuite] Fix Wunused-result warning in until-reverse.c

[gdb-buildbot@sergiodj.net]

*** TEST RESULTS FOR COMMIT 53ae0aa9c65bc41b6f67f52a657b9f5339a331be ***

commit 53ae0aa9c65bc41b6f67f52a657b9f5339a331be
Author:     Tom de Vries <tdevries@suse.de>
AuthorDate: Fri May 1 11:04:22 2020 +0200
Commit:     Tom de Vries <tdevries@suse.de>
CommitDate: Fri May 1 11:04:22 2020 +0200

    [gdb/testsuite] Fix Wunused-result warning in until-reverse.c
    
    When running test-case gdb.reverse/until-reverse.exp or
    gdb.reverse/until-precsave.exp with gcc-10, we run into a Wunused-result
    warning:
    ...
    gdb compile failed, gdb.reverse/until-reverse.c: In function 'main':
    gdb.reverse/until-reverse.c:40:14: warning: ignoring return value of \
      'malloc' declared with attribute 'warn_unused_result' [-Wunused-result]
       40 |       (void) malloc (1);
          |              ^~~~~~~~~~
    ...
    
    Fix this by using the result of malloc as argument to a free call.
    
    Tested on x86_64-linux.
    
    gdb/testsuite/ChangeLog:
    
    2020-05-01  Tom de Vries  <tdevries@suse.de>
    
            * gdb.reverse/until-reverse.c (main): Fix Wunused-result warning.

diff --git a/gdb/testsuite/ChangeLog b/gdb/testsuite/ChangeLog
index e2bf45b3e3..210499af06 100644
--- a/gdb/testsuite/ChangeLog
+++ b/gdb/testsuite/ChangeLog
@@ -1,3 +1,7 @@
+2020-05-01  Tom de Vries  <tdevries@suse.de>
+
+	* gdb.reverse/until-reverse.c (main): Fix Wunused-result warning.
+
 2020-04-30  Hannes Domani  <ssbssa@yahoo.de>
 
 	PR gdb/18706
diff --git a/gdb/testsuite/gdb.reverse/until-reverse.c b/gdb/testsuite/gdb.reverse/until-reverse.c
index e523235f34..a8d8aed9aa 100644
--- a/gdb/testsuite/gdb.reverse/until-reverse.c
+++ b/gdb/testsuite/gdb.reverse/until-reverse.c
@@ -37,7 +37,8 @@ main (int argc, char **argv, char **envp)
     {
       /* We're used by a test that requires malloc, so make sure it is
 	 in the executable.  */
-      (void) malloc (1);
+      void *p = malloc (1);
+      free (p);
       return 1;
     }