MT#55283 fix opus fmtp booboo

Fixes #2017

Change-Id: I4931cce077dd54209f2342b962a144bce965db25
(cherry picked from commit 388f6342ed)

lib/codeclib.c

@@ -2338,7 +2338,7 @@ static void opus_parse_format_cb(str *key, str *token, void *data) {
 		YNFLAG(CSH_LOOKUP("sprop-stereo"), stereo_send)
 		YNFLAG(CSH_LOOKUP("useinbandfec"), fec_recv)
 		YNFLAG(CSH_LOOKUP("cbr"), cbr)
-		YNFLAG(CSH_LOOKUP("usedtx"), fec_recv)
+		YNFLAG(CSH_LOOKUP("usedtx"), usedtx)
 #undef YNFLAG
 		case CSH_LOOKUP("maxplaybackrate"):
 			opts->opus.maxplaybackrate = str_to_i(token, 0);

t/auto-daemon-tests.pl

@@ -1891,7 +1891,7 @@ c=IN IP4 203.0.113.1
 t=0 0
 m=audio PORT RTP/AVP 96 0
 a=rtpmap:96 opus/48000/2
-a=fmtp:96 stereo=0; sprop-stereo=0; useinbandfec=0; cbr=0; maxplaybackrate=32000; maxaveragebitrate=40000; sprop-maxcapturerate=16000
+a=fmtp:96 stereo=0; sprop-stereo=0; useinbandfec=0; usedtx=0; cbr=0; maxplaybackrate=32000; maxaveragebitrate=40000; sprop-maxcapturerate=16000
 a=rtpmap:0 PCMU/8000
 a=sendrecv
 a=rtcp:PORT