Task #449 - fixed.err

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Error: CLANG_WARNING:
git-2.44.0-build/git-2.44.0/reftable/reader.c:327:45: warning[core.NullDereference]: Access to field 'full_block_size' results in a dereference of a null pointer (loaded from field 'br')
#  325|   				 struct table_iter *src)
#  326|   {
#  327|-> 	uint64_t next_block_off = src->block_off + src->bi.br->full_block_size;
#  328|   	struct block_reader br = { 0 };
#  329|   	int err = 0;

Error: CLANG_WARNING:
git-2.44.0-build/git-2.44.0/reftable/stack.c:1182:3: warning[deadcode.DeadStores]: Value stored to 'lock_file_fd' is never read
# 1180|   	if (lock_file_fd >= 0) {
# 1181|   		close(lock_file_fd);
# 1182|-> 		lock_file_fd = -1;
# 1183|   	}
# 1184|   	if (have_lock) {