pcie: Remove redundant test in pcie_mmcfg_data_{read,write}()

These functions have an explicit test for accesses above the device's
config size.  But pci_host_config_{read,write}_common() which they're
about to call already have checks against the config space limit and
do the right thing.  So, remove the redundant tests.
Signed-off-by: NDavid Gibson <david@gibson.dropbear.id.au>
Message-Id: <20190424041959.4087-2-david@gibson.dropbear.id.au>

hw/pci/pcie_host.c

@@ -47,11 +47,6 @@ static void pcie_mmcfg_data_write(void *opaque, hwaddr mmcfg_addr,
     }
     addr = PCIE_MMCFG_CONFOFFSET(mmcfg_addr);
     limit = pci_config_size(pci_dev);
-    if (limit <= addr) {
-        /* conventional pci device can be behind pcie-to-pci bridge.
-           256 <= addr < 4K has no effects. */
-        return;
-    }
     pci_host_config_write_common(pci_dev, addr, limit, val, len);
 }
 
@@ -70,11 +65,6 @@ static uint64_t pcie_mmcfg_data_read(void *opaque,
     }
     addr = PCIE_MMCFG_CONFOFFSET(mmcfg_addr);
     limit = pci_config_size(pci_dev);
-    if (limit <= addr) {
-        /* conventional pci device can be behind pcie-to-pci bridge.
-           256 <= addr < 4K has no effects. */
-        return ~0x0;
-    }
     return pci_host_config_read_common(pci_dev, addr, limit, len);
 }