Workaround for https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88835

diff --git a/tests/backtrace.c b/tests/backtrace.c
index 05e8ef8..d621fbf 100644
--- a/tests/backtrace.c
+++ b/tests/backtrace.c
@@ -185,7 +185,7 @@ frame_callback (Dwfl_Frame *state, void *frame_arg)
     symname = dwfl_module_addrname (mod, pc_adjusted);
 
   printf ("#%2d %#" PRIx64 "%4s\t%s\n", *framenop, (uint64_t) pc,
-	  ! isactivation ? "- 1" : "", symname);
+	  ! isactivation ? "- 1" : "", symname ?: "<null>");
   pid_t tid = dwfl_thread_tid (thread);
   callback_verify (tid, *framenop, pc, symname, dwfl);
   (*framenop)++;

diff --git a/tests/backtrace-dwarf.c b/tests/backtrace-dwarf.c
index dfbf185..f446bc3 100644
--- a/tests/backtrace-dwarf.c
+++ b/tests/backtrace-dwarf.c
@@ -101,7 +101,7 @@ frame_callback (Dwfl_Frame *state, void *frame_arg)
   if (mod)
     symname = dwfl_module_addrname (mod, pc_adjusted);
 
-  printf ("%#" PRIx64 "\t%s\n", (uint64_t) pc, symname);
+  printf ("%#" PRIx64 "\t%s\n", (uint64_t) pc, symname ?: "<null>");
 
   if (symname && (strcmp (symname, "main") == 0
 		  || strcmp (symname, ".main") == 0))