sdpops: fixed usage of delim param in sdp_codec_in_str()

- matching codecs in a comma separated list should work now
- reported by Juha Heinanen as part of testing keep_codecs_by_name()
(cherry picked from commit 83253d3a5cc08ce581fad88378de5eb3bd7fc784)

modules/sdpops/sdpops_mod.c

@@ -200,7 +200,7 @@ int sdp_codec_in_str(str *allcodecs, str* codec, char delim)
 				}
 			}
 		}
-		if(allcodecs->s[i]==' ')
+		if(allcodecs->s[i]==delim)
 			cmp = 1;
 		else
 			cmp = 0;