Fix NPE in VideoCaptureCamera.isZoomSupported()

Based on crash reports it appears possible for open() to return null
without throwing an exception. getCameraParameters() handles this case
gracefully by returning null but isZoomSupported() will then try to call
release() on the null Camera. The release() call is unecessary because
getCameraParameters() already releases the Camera on error.

Bug: 1149283
Change-Id: I1a5522fa3179f3b6389e5dff83a0ca379f9f44ac
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2542785
Commit-Queue: Reilly Grant <reillyg@chromium.org>
Commit-Queue: Min Qin <qinmin@chromium.org>
Auto-Submit: Reilly Grant <reillyg@chromium.org>
Reviewed-by: Min Qin <qinmin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#828012}

media/capture/video/android/java/src/org/chromium/media/VideoCaptureCamera.java

@@ -199,7 +199,6 @@ public class VideoCaptureCamera
         }
         android.hardware.Camera.Parameters parameters = getCameraParameters(camera);
         if (parameters == null) {
-            camera.release();
             return false;
         }