FS-7513: break is safer than continue

when the encoder returns 0, it means no more data will come and we should not try again

src/mod/applications/mod_conference/mod_conference.c

@@ -1595,7 +1595,7 @@ static void write_canvas_image_to_codec_group(conference_obj_t *conference, code
 			switch_assert((encode_status == SWITCH_STATUS_SUCCESS && frame->m) || !frame->m);
 
 			if (frame->datalen == 0) {
-				continue;
+				break;
 			}
 
 			if (frame->timestamp) {

src/switch_core_media.c

@@ -10393,7 +10393,7 @@ SWITCH_DECLARE(switch_status_t) switch_core_session_write_video_frame(switch_cor
 				frame->flags &= ~SFF_PICTURE_RESET;
 			}
 
-			if (frame->datalen == 0) continue;
+			if (frame->datalen == 0) break;
 
 			switch_set_flag(frame, SFF_RAW_RTP_PARSE_FRAME);
 			status = switch_core_session_write_encoded_video_frame(session, frame, flags, stream_id);