nvc0: Fix uninitialized width/height/depth warning.
This can happen if view->resource is false. Fixes a warning in GCC 9+ that's been bugging me for a very long time when building Mesa. Signed-off-by: Joshua Ashton <firstname.lastname@example.org> Part-of: <!12955>
!12955 with nvc0-warning-fix in 10 minutes and 2 seconds (queued for 2 seconds)34 jobs for