CameraBase: Don't return an sp<> by reference
If the server dies, the binder death callback clears out the global camera service sp<>, and any current references to it will become quite unhappy. Test: Camera CTS passes Bug: 31992879 AOSP-Change-Id: I2966bed35d0319e3f26e3d4b1b8dc08006a22348 CVE-2017-0544 Change-Id: Ib7ef455366927b0471f8fcabdd5a54e38e375d41 (cherry picked from commit 4b49489c)
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