Replace the magic '4' by ARRAY_SIZE(mem->alias) which is more explicit.

Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
---
 hw/pci-host/pam.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/hw/pci-host/pam.c b/hw/pci-host/pam.c
index a4962057833..4712260025a 100644
--- a/hw/pci-host/pam.c
+++ b/hw/pci-host/pam.c
@@ -51,7 +51,7 @@ void init_pam(DeviceState *dev, MemoryRegion *ram_memory,
                              start, size);
 
     memory_region_transaction_begin();
-    for (i = 0; i < 4; ++i) {
+    for (i = 0; i < ARRAY_SIZE(mem->alias); ++i) {
         memory_region_set_enabled(&mem->alias[i], false);
         memory_region_add_subregion_overlap(system_memory, start,
                                             &mem->alias[i], 1);
-- 
2.26.2