Fix error message in camera test when no video interface is available.

BUG=chrome-os-partner:20609
TEST=None

Original-Change-Id: Ibcdc6ca2cc3bcfefa4c4125fc205b0f4d60091f7
Change-Id: I959829fd5d02381c74d45516cb7683275aa80030
Reviewed-on: https://chromium-review.googlesource.com/223170
Reviewed-by: Shawn Nematbakhsh <shawnn@chromium.org>
Commit-Queue: Shawn Nematbakhsh <shawnn@chromium.org>
Tested-by: Shawn Nematbakhsh <shawnn@chromium.org>
1 file changed