AdapterService: Check the PIN code length before using

The length is assigned by the framework. We should be better to check
again before using, and dropped any unexcepted input.

Bug: 139287605
Test: PoC
Change-Id: Ie2dd01e0b192e7ed1fe4b464618ddfa415dbf15c
Merged-In: Ie2dd01e0b192e7ed1fe4b464618ddfa415dbf15c
(cherry picked from commit da3422f1987b791c841698098861f0af23136b7c)
1 file changed