CompressFileToBlob: add an explicit seek to make sure we're at the start

Source/Core/DiscIO/CompressedBlob.cpp

@@ -216,6 +216,8 @@ bool CompressFileToBlob(const std::string& infile_path, const std::string& outfi
   outfile.Seek(sizeof(CompressedBlobHeader), SEEK_CUR);
   // seek past the offset and hash tables (we will write them at the end)
   outfile.Seek((sizeof(u64) + sizeof(u32)) * header.num_blocks, SEEK_CUR);
+  // seek to the start of the input file to make sure we get everything
+  infile.Seek(0, SEEK_SET);
 
   // Now we are ready to write compressed data!
   u64 position = 0;