btf: check hash maps are non-null before emptying

These maps will always be non-null in btf_finalize under normal
circumstances, but be safe and verify that before trying to empty them.

gcc/
	* btfout.cc (btf_finalize): Check that hash maps are non-null before
	emptying them.

1 files changed, 10 insertions, 4 deletions

diff --git a/gcc/btfout.cc b/gcc/btfout.cc
index 083ca48..4a6b545 100644
--- a/gcc/btfout.cc
+++ b/gcc/btfout.cc
@@ -1661,13 +1661,19 @@ btf_finalize (void)
   datasecs.release ();
 
   funcs = NULL;
-  func_map->empty ();
-  func_map = NULL;
+  if (func_map)
+    {
+      func_map->empty ();
+      func_map = NULL;
+    }
 
   if (debug_prune_btf)
     {
-      btf_used_types->empty ();
-      btf_used_types = NULL;
+      if (btf_used_types)
+	{
+	  btf_used_types->empty ();
+	  btf_used_types = NULL;
+	}
 
       fixups.release ();
       forwards = NULL;