Fix sanitizer in InputFlinger Reader/Dispatcher.

Refactor for loops that were generating runtime errors on integer
sanitized builds.

Bug: 30969751
Test: Compiles and boots without runtime errors.

Change-Id: I5772333b8060d643c756f229187d02ae5caa7ed7
Merged-In: I5772333b8060d643c756f229187d02ae5caa7ed7
2 files changed