hw/cxl: Fix out of bound array access

According to cxl_interleave_ways_enc(), fw->num_targets is allowed to be up
to 16. This also corresponds to CXL r3.0 spec. So, the fw->target_hbs[]
array is iterated from 0 to 15. But it is statically declared of length 8.
Thus, out of bound array access may occur.

Fixes: c28db9e ("hw/pci-bridge: Make PCIe and CXL PXB Devices inherit from TYPE_PXB_DEV")
Signed-off-by: Dmitry Frolov <frolov@swemel.ru>
Reviewed-by: Michael Tokarev <mjt@tls.msk.ru>
Link: https://lore.kernel.org/r/20230913101055.754709-1-frolov@swemel.ru
Cc: qemu-stable@nongnu.org
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>

include/hw/cxl/cxl.h

@@ -29,7 +29,7 @@ typedef struct PXBCXLDev PXBCXLDev;
 typedef struct CXLFixedWindow {
     uint64_t size;
     char **targets;
-    PXBCXLDev *target_hbs[8];
+    PXBCXLDev *target_hbs[16];
     uint8_t num_targets;
     uint8_t enc_int_ways;
     uint8_t enc_int_gran;