drivers/ftdi: fix an incompatible pointer type error

[ivq]

Fix the build error:

src/jtag/drivers/ftdi.c:1082:61: error: passing argument 4 of 'oscan1_mpsse_clock_data' from incompatible pointer type [-Werror=incompatible-pointer-types]
 1082 |                 oscan1_mpsse_clock_data(mpsse_ctx, NULL, 0, &back0, 0, 32, ftdi_jtag_mode);
      |                                                             ^~~~~~
      |                                                             |
      |                                                             uint32_t * {aka unsigned int *}
src/jtag/drivers/ftdi.c:812:110: note: expected 'uint8_t *' {aka 'unsigned char *'} but argument is of type 'uint32_t *' {aka 'unsigned int *'}
  812 | static void oscan1_mpsse_clock_data(struct mpsse_ctx *ctx, const uint8_t *out, unsigned out_offset, uint8_t *in,
      |                                                                                                     ~~~~~~~~~^~
cc1: all warnings being treated as errors

Tested on archlinux, GCC 13.2.1.

[fanghuaqi]

LGTM