out-of-range bias in affine.c

[mu-triv]

In this block of the code:
https://github.com/sonydevworld/spresense/blob/master/sdk/modules/dnnrt/src/functions/affine.c#L210

The pointer b points outside of the valid bias, when p->base_loop_size > 1 and p->bias is not NULL. This will cause affine's wrong computations.

This code block should be:

      if (bias)
        {
          float *b = bias;
          for (i = 0; i < output_loop_size; i++)
            {
              y[i] += b[i];
            }
        }