[RFA/mips] Fix crash trying to print long double float

[Andrew Cagney]

> Because the gdbarch vector tells GDB that TARGET_LONG_DOUBLE_BIT = 64bit,
> we end up returning a NULL floatformat. And unfortunately for us, we
> immediatly use that NULL floatformat to feed it to floatformat_is_valid(),
> which dereferences it without checking that it's not NULL before hand.
> This causes the SEGV.  See values.c:unpack_double():
> 
>         if (!floatformat_is_valid (floatformat_from_type (type), valaddr))
>           {
>             *invp = 1;
>             return 0.0;
>           }

Does the attached stop the crash?

Andrew

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