Fix bug that we use the return value of bind service incorrectly.

In the last CL, the negation operator "!" was mistakenly removed.
Adding it back.

Bug: 172607204
Test: manual. Send sms via carrier service and observe there's no
intermediate error message.

Change-Id: I45a5da7f759818d4e2e690e63127b8745634106a
Merged-In: I45a5da7f759818d4e2e690e63127b8745634106a