public C13FileChecksum getFileChecksumByOffset(int offset) {
		return fileChecksumsByOffset.get(offset);
	}
Returns the C13 file checksum for the offset of the record in the checksum table
@param offset the offset of the record
@return the checksum or null if record not found
Ghidra/Features/PDB/src/main/java/ghidra/app/util/bin/format/pdb2/pdbreader/FileChecksumsC13Section.java