[binutils-gdb] libctf: tests: fix clang 21 uninitialized variable warning

[Nick Alcock]

https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=b9e48061e06ec0c181757c9e80cc4dc72d614f4f

commit b9e48061e06ec0c181757c9e80cc4dc72d614f4f
Author: Nick Alcock <nick.alcock@oracle.com>
Date:   Sat Oct 18 13:26:24 2025 +0100

    libctf: tests: fix clang 21 uninitialized variable warning
    
    The warning is spurious (the variable is unused in this situation),
    but clang cannot know that.
    
    libctf/ChangeLog:
    
            * testsuite/libctf-writable/symtypetab-nonlinker-writeout.c:
              Initialize dummy variable.

Diff:
---
 libctf/testsuite/libctf-writable/symtypetab-nonlinker-writeout.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libctf/testsuite/libctf-writable/symtypetab-nonlinker-writeout.c b/libctf/testsuite/libctf-writable/symtypetab-nonlinker-writeout.c
index 7a2b88d6dfa..db11c36cb95 100644
--- a/libctf/testsuite/libctf-writable/symtypetab-nonlinker-writeout.c
+++ b/libctf/testsuite/libctf-writable/symtypetab-nonlinker-writeout.c
@@ -25,7 +25,7 @@ try_maybe_reporting (int report)
   ctf_dict_t *fp;
   ctf_id_t func, func2, func3, base, base2, base3;
   ctf_encoding_t e = { CTF_INT_SIGNED, 0, sizeof (long) };
-  ctf_id_t dummy;
+  ctf_id_t dummy = 0;
   ctf_funcinfo_t fi;
   ctf_next_t *i = NULL;
   ctf_id_t symtype;