Vulkan: Unmap buffer when adding to mBufferFreeList The commit b5af8bde13 moved the unmap call on a buffer to when it is placed in mBufferFreeList. There was one place that was missed, rectifying that oversight here. Bug: angleproject:5689 Change-Id: Iaed2916de374d55ab59276e2679c23ed7ef9c4e8 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2733476 Commit-Queue: Mohan Maiya <m.maiya@samsung.com> Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org> Reviewed-by: Jamie Madill <jmadill@chromium.org>