vt82c686: avoid out-of-bounds read

superio_ioport_readb can read the 256th element of the array.
Coverity reports an out-of-bounds write in superio_ioport_writeb,
but it does not show the corresponding out-of-bounds read
because it cannot prove that it can happen.  Fix the root
cause of the problem (zhanghailang's patch instead fixes
the logic in superio_ioport_writeb).
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Nzhanghailiang <zhang.zhanghailiang@huawei.com>
Signed-off-by: NMichael Tokarev <mjt@tls.msk.ru>
Cc: qemu-stable@nongnu.org
(cherry picked from commit 9feb8ade)
Signed-off-by: NMichael Roth <mdroth@linux.vnet.ibm.com>

hw/isa/vt82c686.c

@@ -36,7 +36,7 @@
 
 typedef struct SuperIOConfig
 {
-    uint8_t config[0xff];
+    uint8_t config[0x100];
     uint8_t index;
     uint8_t data;
 } SuperIOConfig;