Remove wildcard assert from desugar

lib/desugar.c

@@ -98,20 +98,8 @@ static void desugar_qmark(regex_term_t *term)
 
 static void desugar_term(regex_term_t *term)
 {
-	switch (term->type) {
-	case REGEX_TERM_WILDCARD:
-		assert(false);
-		break;
-
-	case REGEX_TERM_SUBEXPR:
+	if (REGEX_TERM_SUBEXPR == term->type)
 		desugar_regex(&term->subexpr);
-		break;
-
-	case REGEX_TERM_CLASS:
-	case REGEX_TERM_LITERAL:
-	case REGEX_TERM_EMPTY:
-		break;
-	}
 
 	switch (term->quantifier) {
 	case REGEX_QUANTIFIER_PLUS: