Prevent division-by-zero error when calculating battery capacity.

Bug: 34255953
Change-Id: Ie072cd5dc26faf17e8ab46ea0795750396f087c2
Fixes: 34255953
Test: formula change CL. No existing unit tests found.

core/java/com/android/internal/os/BatteryStatsImpl.java

@@ -9711,7 +9711,7 @@ public class BatteryStatsImpl extends BatteryStats {
                 }
                 doWrite = true;
                 resetAllStatsLocked();
-                if (chargeUAh > 0) {
+                if (chargeUAh > 0 && level > 0) {
                     // Only use the reported coulomb charge value if it is supported and reported.
                     mEstimatedBatteryCapacity = (int) ((chargeUAh / 1000) / (level / 100.0));
                 }