bcachefs: fix a replicas bug

Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

fs/bcachefs/replicas.c

@@ -267,6 +267,8 @@ int bch2_mark_bkey_replicas(struct bch_fs *c,
 	struct bch_replicas_entry_padded search;
 	int ret;
 
+	memset(&search, 0, sizeof(search));
+
 	if (type == BKEY_TYPE_EXTENTS) {
 		struct bch_devs_list cached = bch2_bkey_cached_devs(k);
 		unsigned i;
@@ -564,6 +566,8 @@ bool bch2_bkey_replicas_marked(struct bch_fs *c,
 	struct bch_replicas_entry_padded search;
 	bool ret;
 
+	memset(&search, 0, sizeof(search));
+
 	if (type == BKEY_TYPE_EXTENTS) {
 		struct bch_devs_list cached = bch2_bkey_cached_devs(k);
 		unsigned i;