unchecked error in avro_raw_string_ensure_buf leads to crash

[Aditya Jain]

Hi developers,

I have  a concern in avro version (avro-c-1.8.1) . while doing encoding, we 
don't check for (return ENOMEM) from the internal APIs, in which the memory is 
allocated to store the field.

void
avro_raw_string_set(avro_raw_string_t *str, const char *src)
{
        size_t  length = strlen(src);
        avro_raw_string_ensure_buf(str, length+1);--->return value not checked.
        memcpy((void *) str->wrapped.buf, src, length+1);
        str->wrapped.size = length+1;
}

So in case there is a memory failure , the memcpy will still go ahead, and it 
leads to crash.
How can we go about fixing this ? I saw the code in 1-9.0 as well, but saw the 
same code in that release also.

Thanks
Aditya jain.