fix: skip missing file extraction

Missing files were not skipped and could end up extracted with stack
garbage as their bundle IDs, path hashes and offsets/sizes.

This can manifest even with `path_rep` file lists as sometimes files
are just not bundled up as file entries but still have path entries.

We now explicitly skip adding any missing wanted files to the set of
files to extract to properly report and count them.

bun_extract_file.cpp

@@ -177,25 +177,26 @@ int main(int argc, char *argv[]) {
 
   struct extract_info {
     std::string path;
-    uint32_t offset;
-    uint32_t size;
+    uint32_t offset{};
+    uint32_t size{};
   };
 
   std::unordered_map<uint32_t, std::vector<extract_info>> bundle_parts_to_extract;
-  for (auto path : wanted_paths) {
+  for (auto &path : wanted_paths) {
     if (path.front() == '"' && path.back() == '"') {
       path = path.substr(1, path.size() - 2);
     }
 
     int32_t file_id = BunIndexLookupFileByPath(idx, path.c_str());
     if (file_id < 0) {
       fprintf(stderr, "Could not find file \"%s\"\n", path.c_str());
+      continue;
     }
 
-    uint32_t bundle_id;
+    uint32_t bundle_id{};
 
-    uint64_t path_hash;
-    extract_info ei;
+    uint64_t path_hash{};
+    extract_info ei{};
     ei.path = path;
 
     BunIndexFileInfo(idx, file_id, &path_hash, &bundle_id, &ei.offset, &ei.size);