py, unix: Allow to compile with -Wsign-compare.
See issue #699.
diff --git a/py/bc.c b/py/bc.c
index 6aa2017..9498b4f 100644
--- a/py/bc.c
+++ b/py/bc.c
@@ -116,7 +116,7 @@
// Apply processing and check below only if we don't have kwargs,
// otherwise, kw handling code below has own extensive checks.
if (n_kw == 0 && !self->has_def_kw_args) {
- if (n_args >= self->n_pos_args - self->n_def_args) {
+ if (n_args >= (mp_uint_t)(self->n_pos_args - self->n_def_args)) {
// given enough arguments, but may need to use some default arguments
for (mp_uint_t i = n_args; i < self->n_pos_args; i++) {
code_state->state[n_state - 1 - i] = self->extra_args[i - (self->n_pos_args - self->n_def_args)];