[EMULATORS] Fixing CID 1201430: Out-of-bounds read (OVERRUN)

/emulators/pci/pci_emu_core.c: 459 in pci_emu_config_space_read()
453     				   __func__, reg_offs);
454     			vmm_spin_unlock_irqrestore(&class->lock,flags);
455     			return VMM_EINVALID;
456     		}
457     	}
458
>>>     CID 1201430:  Out-of-bounds read  (OVERRUN)
>>>     Overrunning array of 63 bytes at byte offset 63 by dereferencing pointer "(void const *)((u8 *)&class->conf_header + reg_offs)".
459     	memcpy(&ret, (const void *)(((u8 *)(&class->conf_header)) + reg_offs), size);
460
461     	vmm_spin_unlock_irqrestore(&class->lock, flags);
462
463     	return ret;
464     }

Signed-off-by: Jean-Christophe DUBOIS <jcd@tribudubois.net>