esp_gdbstub/xtensa: Trying to dump FPU registers when FPU is not enabled (IDFGH-16875)

[rojer]

I'm pretty sure that in this check we should be testing for true == cp_enabled instead of false.

@igrr @dmitry1945 FYI

[rojer]

in fact, i think smth like this would be cleaner, as technically CPENABLE is a bitfield:

    uint32_t fpu_enabled;
    RSR(CPENABLE, fpu_enabled);
    fpu_enabled &= 1;                                                                                                                                                                          |
    ...
    bool use_fpu_regs = (fpu_enabled && (current_xt_coproc_owner_sa[0] == 1) && (current_fpu_ptr == (uint32_t*)current_xt_coproc_owner_sa[2]));