Increase the number of multiplexed monitor devices.

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@2445 c046a42c-6fe2-441c-8c8c-71466251a162

vl.c

@@ -1232,7 +1232,7 @@ static CharDriverState *qemu_chr_open_null(void)
 /* MUX driver for serial I/O splitting */
 static int term_timestamps;
 static int64_t term_timestamps_start;
-#define MAX_MUX 2
+#define MAX_MUX 4
 typedef struct {
     IOCanRWHandler *chr_can_read[MAX_MUX];
     IOReadHandler *chr_read[MAX_MUX];