unit: use proper pointer to uint8_t in test_snep_read_recv_fragments()

Raw data bytes should be passed as pointer to uint8_t and the calling
function already uses that type.  This fixes warning:

    unit/test-snep-read.c: In function ‘test_snep_read_recv_fragments’:
    unit/test-snep-read.c:408:21: error: pointer of type ‘void *’ used in arithmetic [-Werror=pointer-arith]
      408 |   memcpy(data_recvd + offset, resp, nbytes);
          |                     ^

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
1 file changed