Fix calloc argument order warning/error

[R055A]

Fixes #101 - calloc warning error returned from line 1476 in src/jtag/drivers/ulink.c

Before fix:

tdo_buffer_start = calloc(sizeof(uint8_t), scan_size_bytes);

After fix:

tdo_buffer_start = calloc(scan_size_bytes, sizeof(uint8_t));