Fix an integer overflow in LcfReader::ReadString resulting in a heap corruption.

Thanks to @Scrippie

Fixes #194

Author: Ghabry

src/reader_lcf.cpp

@@ -160,10 +160,9 @@ void LcfReader::Read<uint32_t>(std::vector<uint32_t> &buffer, size_t size) {
 }
 
 void LcfReader::ReadString(std::string& ref, size_t size) {
-	char* chars = new char[size + 1];
-	chars[size] = '\0';
+	char* chars = new char[size];
 	Read(chars, 1, size);
-	ref = Encode(std::string(chars));
+	ref = Encode(std::string(chars, size));
 	delete[] chars;
 }