[decompiler] Support v5 data file link data (#3076)

Fix the implementation of `link_v5` so it works on "data" files for jak
3.

common/goos/Object.cpp

@@ -66,7 +66,6 @@ SymbolTable::~SymbolTable() {
 }
 
 InternedSymbolPtr SymbolTable::intern(const char* str) {
-  InternedSymbolPtr result;
   size_t string_len = strlen(str);
   u32 hash = crc32((const u8*)str, string_len);