cluster-cache: fix get() not assigning data buffer to another cache entry after evicting it

src/cluster-cache.c

@@ -162,12 +162,14 @@ enum ec3_status cluster_cache_get(
 		return status;
 	}
 
+	entry->e_data = buf;
+
 	size_t nr_read = 0;
 	enum b_status status2 = b_file_read(
 		cache->c_storage,
 		entry->e_storage_offset,
 		entry->e_length,
-		buf,
+		entry->e_data,
 		&nr_read);
 
 	if (!B_OK(status2)) {
@@ -178,7 +180,7 @@ enum ec3_status cluster_cache_get(
 		return EC3_ERR_IO_FAILURE;
 	}
 
-	memcpy(out, buf, nr_read);
+	memcpy(out, entry->e_data, nr_read);
 	*cluster_size = nr_read;
 	return EC3_SUCCESS;
 }