topology: apply the same type to compared two variables

topology: apply the same type to compared two variables

This commit fixes below compiler warnings.

data.c: In function ‘get_token_value’:
data.c:262:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for (i = 0; i < tokens->num_tokens; i++) {
                ^
data.c: In function ‘copy_tuples’:
data.c:351:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for (i = 0; i < tuples->num_sets ; i++) {
                ^
data.c:378:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for (j = 0; j < tuple_set->num_tuples; j++) {
                 ^
data.c: In function ‘tplg_free_tuples’:
data.c:723:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for (i = 0; i < tuples->num_sets; i++)
                ^

Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Signed-off-by: Takashi Iwai <tiwai@suse.de>