MT#55283 Defuse kernelize error for SRTP encryption not yet negotiated

Similar in spirit to f2d57de078, but for
the encrypt case.

Closes #2127

Change-Id: I06c82f4a1d768a863922e2240aebb6c1d243e269
(cherry picked from commit e6469c006b)

daemon/media_socket.c

@@ -1648,7 +1648,7 @@ static const char *kernelize_target(kernelize_state *s, struct packet_stream *st
 
 	int ret = handler->in->kernel(&reti->decrypt, stream);
 	if (ret) {
-		ilog(LOG_NOTICE, "SRTP not yet negotiated");
+		ilog(LOG_NOTICE, "Decryption SRTP not yet negotiated");
 		return NULL;
 	}
 	if (!reti->decrypt.cipher || !reti->decrypt.hmac)
@@ -1881,7 +1881,14 @@ static const char *kernelize_one(kernelize_state *s,
 		}
 	}
 
-	handler->out->kernel(&redi->output.encrypt, sink);
+	int ret = handler->out->kernel(&redi->output.encrypt, sink);
+	if (ret) {
+		if (sink != stream)
+			mutex_unlock(&sink->lock);
+		g_free(credi);
+		ilog(LOG_NOTICE, "Encryption SRTP not yet negotiated");
+		return NULL;
+	}
 	sink_handler->rtpext->kernel(&redi->output, media, sink_media);
 
 	if (sink != stream)