pkcs15init: Find reference loops in all the macro values

For some reason the macro value is a linked list and the reference loop
was checked only in the first value, but the evaluation was taking into
the account all the values in the linked list.

The following input would cause stack overflow in the past

    macros {
        e =1
        o =$e
        e =-$e
    }
    filesystem {
        DF {
            size =$o

Thanks oss-fuzz

https://oss-fuzz.com/testcase-detail/5289592319508480

src/pkcs15init/profile.c

@@ -2013,27 +2013,36 @@ get_inner_word(char *str, char word[WORD_SIZE]) {
  * Function returns 1 if a reference loop is detected, 0 otherwise.
  */
 static int
-check_macro_reference_loop(const char *start_name, sc_macro_t *macro, sc_profile_t *profile, int depth) {
-	char *macro_value = NULL;
+check_macro_reference_loop(const char *start_name, sc_macro_t *macro, sc_profile_t *profile, int depth)
+{
+	scconf_list *value;
 	char *name = NULL;
+	sc_macro_t	*m;
 	char word[WORD_SIZE];
 
 	if (!start_name || !macro || !profile || depth == 16)
 		return 1;
 
-	/* Find name in macro value */
-	macro_value = macro->value->data;
-	if (!(name = strchr(macro_value, '$')))
-		return 0;
-	/* Extract the macro name from the string */
-	get_inner_word(name + 1, word);
-	/* Find whether name corresponds to some other macro */
-	if (!(macro = find_macro(profile, word)))
-		return 0;
-	/* Check for loop */
-	if (!strcmp(macro->name, start_name))
-		return 1;
-	return check_macro_reference_loop(start_name, macro, profile, depth + 1);
+	/* For some reason, the macro value is a list where we need to check for references */
+	for (value = macro->value; value != NULL; value = value->next) {
+		/* Find name in macro value */
+		char *macro_value = value->data;
+		if (!(name = strchr(macro_value, '$')))
+			continue;
+		/* Extract the macro name from the string */
+		get_inner_word(name + 1, word);
+		/* Find whether name corresponds to some other macro */
+		if (!(m = find_macro(profile, word)))
+			continue;
+		/* Check for loop */
+		if (!strcmp(m->name, start_name))
+			return 1;
+		/* Reference loop was found to the original macro name */
+		if (check_macro_reference_loop(start_name, m, profile, depth + 1) == 1) {
+			return 1;
+		}
+	}
+	return 0;
 }
 
 static int