Avoids the error-prone repetition of the array size.

Signed-off-by: Bernhard Beschow <shentey@gmail.com>
---
 hw/rtc/mc146818rtc.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/hw/rtc/mc146818rtc.c b/hw/rtc/mc146818rtc.c
index 61e9c0bf99..5a89062b4c 100644
--- a/hw/rtc/mc146818rtc.c
+++ b/hw/rtc/mc146818rtc.c
@@ -726,13 +726,14 @@ static uint64_t cmos_ioport_read(void *opaque, hwaddr addr,
 
 void mc146818rtc_set_cmos_data(MC146818RtcState *s, int addr, int val)
 {
-    if (addr >= 0 && addr <= 127)
+    if (addr >= 0 && addr < ARRAY_SIZE(s->cmos_data)) {
         s->cmos_data[addr] = val;
+    }
 }
 
 int mc146818rtc_get_cmos_data(MC146818RtcState *s, int addr)
 {
-    assert(addr >= 0 && addr <= 127);
+    assert(addr >= 0 && addr < ARRAY_SIZE(s->cmos_data));
     return s->cmos_data[addr];
 }
 
-- 
2.51.1.dirty