From 6c06e1855e7ecdeca3a529adff053e409ebf9502 Mon Sep 17 00:00:00 2001
From: Benjamin Otte <otte@redhat.com>
Date: Thu, 25 Jul 2024 22:06:27 +0200
Subject: [PATCH] roaring: Fix a compiler warning
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This is a simple fix, I did not investigate if NULL is actually possible
here.

In function ‘bitset_container_empty’,
    inlined from ‘bitset_container_const_nonzero_cardinality’ at ../gtk/roaring/roaring.h:1942:13,
    inlined from ‘container_nonzero_cardinality’ at ../gtk/roaring/roaring.h:4055:20,
    inlined from ‘roaring_bitmap_lazy_xor’ at ../gtk/roaring/roaring.c:9727:17:
../gtk/roaring/roaring.h:1928:13: error: potential null pointer dereference [-Werror=null-dereference]
 1928 |   if (bitset->cardinality == BITSET_UNKNOWN_CARDINALITY) {
      |       ~~~~~~^~~~~~~~~~~~~
---
 gtk/roaring/roaring.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/gtk/roaring/roaring.c b/gtk/roaring/roaring.c
index 8774a6e293..89e56c736c 100644
--- a/gtk/roaring/roaring.c
+++ b/gtk/roaring/roaring.c
@@ -9724,7 +9724,7 @@ roaring_bitmap_t *roaring_bitmap_lazy_xor(const roaring_bitmap_t *x1,
                 container_lazy_xor(c1, container_type_1, c2, container_type_2,
                                    &container_result_type);
 
-            if (container_nonzero_cardinality(c, container_result_type)) {
+            if (c && container_nonzero_cardinality(c, container_result_type)) {
                 ra_append(&answer->high_low_container, s1, c,
                           container_result_type);
             } else {