Fix "adb devices -l".

Change 055f1aa4ff58ba71133d506b202ad46612758ded switched to using isalnum(3)
but didn't take into account that isalnum has the opposite sense to the
function it replaced, so the tests should have been inverted.

Bug: http://b/20056546
Change-Id: I90630c0bea69ddbb4a95dc09f79f49d23fd497de
1 file changed