Update ProcessStats.java

https://github.com/CyanogenMod/android_frameworks_base/commit/ee013b9bd6f3f3b017a3648a420707796b7dc275
(Avoid divide-by-zero exception when printing process state)

to avoid issue of hotreboot with more apps on sdcard this should help as reported here -> http://code.google.com/p/android/issues/detail?id=25563#c153