Make QRhi::create() return false when there is no MTLDevice

The interesting part here is that sending messages to a null
object is valid in Objective-C, so without an explicit check it
is not necessarily straightforward to discover that we do not
have working rendering. (because the application won't just
simply crash)

Do the right thing now and return false like other backends do.

Task-number: QTBUG-78994
Change-Id: I0d3c4a49a3fc78f9149f8af4fe67d581e74daae7
Reviewed-by: Paul Olav Tvete <paul.tvete@qt.io>

0 files changed, 0 insertions, 0 deletions