MT#58535 rtpp_flags: parse key/val flags directly

Instead of adding key/val flags to the dictionary for
further parsing later via iteration in `call_ng_main_flags()`,
just call the `call_ng_main_flags()` directly.

Change-Id: Ia893a6b50db7a0659a42c09463169f2c0f5e595e

daemon/call_interfaces.c

@@ -1393,7 +1393,7 @@ static void call_ng_flags_freqs(sdp_ng_flags *out, bencode_item_t *value) {
 	}
 }
 
-static void call_ng_main_flags(sdp_ng_flags *out, str *key, bencode_item_t *value,
+void call_ng_main_flags(sdp_ng_flags *out, str *key, bencode_item_t *value,
 	enum call_opmode opmode)
 {
 	str s = STR_NULL;

daemon/control_ng_flags_parser.c

@@ -460,7 +460,8 @@ generic:
 			call_ng_flags_flags(out, &key, NULL);
 		/* generic flags with value, but no particular processing */
 		else
-			bencode_dictionary_str_add_str(root_dict, &key, &val);
+			call_ng_main_flags(out, &key, bencode_str(buf, &val), opmode);
+
 next:
 		start = eptr;
 	}

include/call_interfaces.h

@@ -287,6 +287,8 @@ void call_interfaces_free(void);
 void call_interfaces_timer(void);
 
 void call_ng_flags_flags(sdp_ng_flags *out, str *s, helper_arg dummy);
+void call_ng_main_flags(sdp_ng_flags *out, str *key, bencode_item_t *value,
+	enum call_opmode opmode);
 
 INLINE struct sdp_manipulations *sdp_manipulations_get_by_id(const sdp_ng_flags *f, enum media_type id) {
 	if (id < 0 || id >= G_N_ELEMENTS(f->sdp_manipulations))