Don't read clc.voipIncomingSequence until range checked sender

code/client/cl_parse.c

@@ -709,7 +709,7 @@ void CL_ParseVoip ( msg_t *msg ) {
 	const int packetsize = MSG_ReadShort(msg);
 	const int flags = MSG_ReadBits(msg, VOIP_FLAGCNT);
 	char encoded[1024];
-	int seqdiff = sequence - clc.voipIncomingSequence[sender];
+	int seqdiff;
 	int written = 0;
 	int i;
 
@@ -753,6 +753,8 @@ void CL_ParseVoip ( msg_t *msg ) {
 
 	Com_DPrintf("VoIP: packet accepted!\n");
 
+	seqdiff = sequence - clc.voipIncomingSequence[sender];
+
 	// This is a new "generation" ... a new recording started, reset the bits.
 	if (generation != clc.voipIncomingGeneration[sender]) {
 		Com_DPrintf("VoIP: new generation %d!\n", generation);