keystore_backend_binder: fix misinterpretation of getKeyCharacteristics return value.

The keystore backend used by racoon interprets the return value of
getKeyCharacteristics such that it thinks that it failed when it didn't.

Test: Initiate VPN connection with racoon.
Bug: 120024003
Change-Id: Ibe936a2d2d81181c10f0dd1075cc5ab3646f736e
1 file changed