MT#58535 Add an empty statement after `rtpp-flags` parsing

A fix for bullseye/buster and focal:

call_interfaces.c: In function 'call_ng_main_flags':
call_interfaces.c:1828:4: error: a label can only be part of a statement and a declaration is not a statement
 1828 |    bencode_item_t * dict;
      |    ^~~~~~~~~~~~~~
make[3]: *** [<builtin>: call_interfaces.strhash.o] Error 1

Switch case has to be followed by a statement, and the declaration
is not, so just follow it by the empty statement.

Change-Id: I7c5ef62dec9ceb404736ec3c4bed84f04b892d24

daemon/call_interfaces.c

@@ -1822,8 +1822,8 @@ static void call_ng_main_flags(sdp_ng_flags *out, str *key, bencode_item_t *valu
 		case CSH_LOOKUP("RTCP-mux"):
 			call_ng_flags_str_list(out, value, call_ng_flags_rtcp_mux, NULL);
 			break;
-		case CSH_LOOKUP("rtpp-flags"):
-		case CSH_LOOKUP("rtpp_flags"):
+		case CSH_LOOKUP("rtpp-flags"):;
+		case CSH_LOOKUP("rtpp_flags"):;
 			/* new dictionary to store rtpp_flags */
 			bencode_item_t * dict;
 			dict = bencode_dictionary(value->buffer);