Fix "adb devices -l".

Change 4895c52db5ead27a2d9ffc4c3f97dbad269e795a 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