Revert "Merge pull request 'Merge all 5 batch PRs: security, CLI features, protocol, performance, tests/docs' (#143) from merge-all-v2 into main"

This reverts commit 29f4f8cde6, reversing
changes made to c6bf7bb84e.

src/shared/delta.c

@@ -108,12 +108,7 @@ DeltaSignature* delta_signature_deserialize(const Data* data) {
     return NULL;
   }
 
-  uint64_t blocks_size = (uint64_t)sig->block_count * sizeof(DeltaBlockSig);
-  if (blocks_size > SIZE_MAX) {
-    free(sig);
-    return NULL;
-  }
-  sig->blocks = malloc((size_t)blocks_size);
+  sig->blocks = malloc(sig->block_count * sizeof(DeltaBlockSig));
   if (!sig->blocks) {
     free(sig);
     return NULL;