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-rw-r--r--metadata/metabuilder.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/metadata/metabuilder.c b/metadata/metabuilder.c
index f45d20ae..03063e68 100644
--- a/metadata/metabuilder.c
+++ b/metadata/metabuilder.c
@@ -1234,7 +1234,7 @@ meta_builder_write (MetaBuilder *builder,
data = mmap (NULL, RANDOM_TAG_OFFSET + 4, PROT_READ|PROT_WRITE, MAP_SHARED, fd2, 0);
- if (data)
+ if (data != MAP_FAILED)
{
old_tag = GUINT32_FROM_BE (*(guint32 *)(data + RANDOM_TAG_OFFSET));
*(guint32 *)(data + ROTATED_OFFSET) = 0xffffffff;