SteamWrap_FileRead buffer overflow

[maaniv]

Function SteamWrap_FileRead code do not put zero to end of string
char *bytesData = (char *)malloc(length);
int32 result = SteamRemoteStorage()->FileRead(fName, bytesData, length);

value returnValue = alloc_string(bytesData);

Must be
char *bytesData = (char *)malloc(length + 1);
int32 result = SteamRemoteStorage()->FileRead(fName, bytesData, length);
*(bytesData + length) = 0;

value returnValue = alloc_string(bytesData);

[larsiusprime]

I believe using alloc_string_len might fix this:
#10

I'm working on a patch.