Port dump_bitset_clear to -fsanitize=undefined

* src/pdumper.c (dump_bitset_clear):
Pacify -fsanitize=undefined by avoiding memset (NULL, x, 0),
which strictly speaking has undefined behavior although it
works on all production platforms I know.

diff --git a/src/pdumper.c b/src/pdumper.c
index 3facd523e4a6bd6521a1e687a7d141737e9bf856..6ab82769ec915a42445d898d7e0c1ff1fbe0df85 100644 (file)
--- a/src/pdumper.c
+++ b/src/pdumper.c
@@ -4923,7 +4923,8 @@ static void
 dump_bitset_clear (struct dump_bitset *bitset)
 {
   int xword_size = sizeof (bitset->bits[0]);
-  memset (bitset->bits, 0, bitset->number_words * xword_size);
+  if (bitset->number_words)
+    memset (bitset->bits, 0, bitset->number_words * xword_size);
 }
 
 struct pdumper_loaded_dump_private