mesa: rearrange texture error checking order

mesa: rearrange texture error checking order

This moves the width/height/depth == 0 check to the front and avoids
doing any other checking when that is the case.

Also moves the dimensions check after the format/type checks so that we
don't bail out with success on a width/height/depth == 0 request when
the format/type don't match.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=91425
Signed-off-by: Ilia Mirkin <imirkin@alum.mit.edu>
Reviewed-by: Brian Paul <brianp@vmware.com>