Fix a few warnings

code/qcommon/md4.c

@@ -177,12 +177,10 @@ static void mdfour_update(struct mdfour *md, byte *in, int n)
 
 static void mdfour_result(struct mdfour *md, byte *out)
 {
-	m = md;
-
-	copy4(out, m->A);
-	copy4(out+4, m->B);
-	copy4(out+8, m->C);
-	copy4(out+12, m->D);
+	copy4(out, md->A);
+	copy4(out+4, md->B);
+	copy4(out+8, md->C);
+	copy4(out+12, md->D);
 }
 
 static void mdfour(byte *out, byte *in, int n)

code/qcommon/msg.c

@@ -246,7 +246,7 @@ int MSG_ReadBits( msg_t *msg, int bits ) {
 		}
 		msg->readcount = (msg->bit>>3)+1;
 	}
-	if ( sgn ) {
+	if ( sgn && bits > 0 && bits < 32 ) {
 		if ( value & ( 1 << ( bits - 1 ) ) ) {
 			value |= -1 ^ ( ( 1 << bits ) - 1 );
 		}

code/qcommon/net_ip.c

@@ -1619,7 +1619,7 @@ Called from NET_Sleep which uses select() to determine which sockets have seen a
 void NET_Event(fd_set *fdr)
 {
 	byte bufData[MAX_MSGLEN + 1];
-	netadr_t from;
+	netadr_t from = {0};
 	msg_t netmsg;
 	
 	while(1)